Annual report pursuant to Section 13 and 15(d)

Derivatives - Additional Information (Details)

v3.8.0.1
Derivatives - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]        
Unrealized gain (loss) on derivatives, net of tax   $ (5,694,000) $ 335,000 $ (2,442,000)
Recognized interest expense on derivatives into earnings, net of tax   (1,144,000) (1,023,000) $ (1,521,000)
Derivative assets   1,900,000    
Derivative liabilities   8,600,000    
Interest rate swaps        
Derivatives, Fair Value [Line Items]        
Unrealized gain (loss) on derivatives, net of tax   (5,700,000) 300,000  
Unrealized gain (loss) on derivatives, tax expense (benefit)   (3,600,000) (200,000)  
Recognized interest expense on derivatives into earnings, net of tax   1,100,000 1,000,000  
Recognized interest expense on derivatives into earnings, tax expense   700,000 $ 600,000  
Additional amount to be classified as an increase to interest expense during next 12 months   $ 2,000,000    
Warrants        
Derivatives, Fair Value [Line Items]        
Warrants issued, shares common stock 1,250,764      
Warrant, exercisable term 3 years      
Warrant, exercise price (in dollars per share) $ 22.50      
Warrants and Rights Outstanding $ 1,500,000