Quarterly report pursuant to Section 13 or 15(d)

Indebtedness - Schedule of Debt (Details)

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Indebtedness - Schedule of Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Unused Borrowing Capacity $ 32,101 $ 12,171
Long term debt, Current 5,591 4,722
Long term debt, Noncurrent 627,196 530,042
Long term debt 632,787 534,764
Recourse debt, Total 191,000 197,000
Bank Line of Credit    
Debt Instrument [Line Items]    
Recourse debt, Long Term 191,000 197,000
Recourse debt, Total 191,000 197,000
Recourse Debt    
Debt Instrument [Line Items]    
Unused Borrowing Capacity 11,501 6,571
Long term debt, Noncurrent 191,000 197,000
Long term debt 191,000 197,000
Recourse Debt | Bank Line of Credit    
Debt Instrument [Line Items]    
Unused Borrowing Capacity $ 11,501 $ 6,571
Maturity Date Apr. 30, 2018 Apr. 30, 2018
Recourse Debt | Bank Line of Credit | Base Rate    
Debt Instrument [Line Items]    
Interest Rate   3.67%
Annual Contractual Interest Rate 2.25% 2.25%
Recourse Debt | Bank Line of Credit | Basis point    
Debt Instrument [Line Items]    
Annual Contractual Interest Rate 3.25% 3.25%
Recourse Debt | Bank Line of Credit | Minimum | Base Rate    
Debt Instrument [Line Items]    
Interest Rate 3.45%  
Recourse Debt | Bank Line of Credit | Maximum | Base Rate    
Debt Instrument [Line Items]    
Interest Rate 5.75%  
Non Recourse Debt    
Debt Instrument [Line Items]    
Unused Borrowing Capacity $ 20,600 $ 5,600
Long term debt, Current 5,591 4,722
Long term debt, Noncurrent 436,196 333,042
Long term debt 441,787 337,764
Non Recourse Debt | Line of Credit    
Debt Instrument [Line Items]    
Unused Borrowing Capacity $ 8,800  
Maturity Date Dec. 31, 2020  
Long term debt, Noncurrent $ 77,100  
Long term debt $ 77,100  
Non Recourse Debt | Line of Credit | Base Rate    
Debt Instrument [Line Items]    
Annual Contractual Interest Rate 1.50%  
Non Recourse Debt | Line of Credit | Basis point    
Debt Instrument [Line Items]    
Annual Contractual Interest Rate 2.50%  
Non Recourse Debt | Line of Credit | Minimum | Basis point    
Debt Instrument [Line Items]    
Interest Rate 2.93%  
Non Recourse Debt | Line of Credit | Maximum | Basis point    
Debt Instrument [Line Items]    
Interest Rate 3.16%  
Non Recourse Debt | Term Loans due in December 2020 and 2021    
Debt Instrument [Line Items]    
Unused Borrowing Capacity $ 1,400  
Long term debt, Current 117  
Long term debt, Noncurrent 33,032  
Long term debt $ 33,149  
Non Recourse Debt | Term Loans due in December 2020 and 2021 | Basis point    
Debt Instrument [Line Items]    
Interest Rate 6.00%  
Annual Contractual Interest Rate 5.00%  
Non Recourse Debt | Term Loan A due in December 2021    
Debt Instrument [Line Items]    
Unused Borrowing Capacity $ 6,400 $ 5,600
Maturity Date Dec. 31, 2021 Dec. 31, 2021
Long term debt, Current $ 727 $ 589
Long term debt, Noncurrent 145,811 146,625
Long term debt $ 146,538 $ 147,214
Non Recourse Debt | Term Loan A due in December 2021 | Basis point    
Debt Instrument [Line Items]    
Interest Rate   3.07%
Annual Contractual Interest Rate 2.75% 2.75%
Non Recourse Debt | Term Loan A due in December 2021 | Minimum | Basis point    
Debt Instrument [Line Items]    
Interest Rate 3.04%  
Non Recourse Debt | Term Loan A due in December 2021 | Maximum | Basis point    
Debt Instrument [Line Items]    
Interest Rate 3.37%  
Non Recourse Debt | Subordinated Term Loan    
Debt Instrument [Line Items]    
Maturity Date   Dec. 31, 2021
Long term debt, Current   $ 116
Long term debt, Noncurrent   22,014
Long term debt   $ 22,130
Non Recourse Debt | Subordinated Term Loan | Basis point    
Debt Instrument [Line Items]    
Interest Rate   6.00%
Annual Contractual Interest Rate   5.00%
Non Recourse Debt | Bank term loan due in September 2022    
Debt Instrument [Line Items]    
Unused Borrowing Capacity $ 4,000  
Maturity Date Sep. 30, 2022  
Long term debt, Current $ 306  
Long term debt, Noncurrent 16,219  
Long term debt $ 16,525  
Non Recourse Debt | Bank term loan due in September 2022 | Basis point    
Debt Instrument [Line Items]    
Interest Rate 2.69%  
Annual Contractual Interest Rate 2.25%  
Non Recourse Debt | Bank term loan due in April 2022    
Debt Instrument [Line Items]    
Interest Rate 6.25% 6.25%
Maturity Date Apr. 30, 2022 Apr. 30, 2022
Long term debt, Current $ 1,206 $ 1,159
Long term debt, Noncurrent 29,043 29,580
Long term debt $ 30,249 $ 30,739
Non Recourse Debt | Notes Payable    
Debt Instrument [Line Items]    
Interest Rate 12.00% 12.00%
Maturity Date Dec. 31, 2018 Dec. 31, 2018
Long term debt, Noncurrent $ 33,748 $ 32,781
Long term debt $ 33,748 $ 32,781
Non Recourse Debt | Solar Asset Backed Securities Class A    
Debt Instrument [Line Items]    
Interest Rate 4.40% 4.40%
Maturity Date Jul. 31, 2024 Jul. 31, 2024
Long term debt, Current $ 3,235 $ 2,858
Long term debt, Noncurrent 101,243 102,042
Long term debt $ 104,478 $ 104,900
Non Recourse Debt | Solar Asset Backed Securities Class B    
Debt Instrument [Line Items]    
Interest Rate 5.38% 5.38%
Maturity Date Jul. 31, 2024 Jul. 31, 2024
Non Recourse Debt | Year Two | Term Loans due in December 2020 and 2021    
Debt Instrument [Line Items]    
Maturity Date Dec. 31, 2021  
Non Recourse Debt | Year One | Term Loans due in December 2020 and 2021    
Debt Instrument [Line Items]    
Maturity Date Dec. 31, 2020