Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Components of Lease Expense (Details)

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Commitments and Contingencies - Components of Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finance lease cost:      
Amortization of right-of-use assets $ 13,999 $ 11,884 $ 11,029
Interest on lease liabilities 1,915 676 640
Operating lease cost 13,159 10,467 10,177
Short-term lease cost 1,349 732 493
Variable lease cost 3,565 3,112 2,502
Sublease income (669) (572) (24)
Total lease cost $ 33,318 $ 26,299 $ 24,817