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, 2020
Dec. 31, 2019
Dec. 31, 2018
Finance lease cost:      
Amortization of right-of-use assets $ 10,151 $ 13,999 $ 11,884
Interest on lease liabilities 890 1,915 676
Operating lease cost 15,592 13,159 10,467
Short-term lease cost 689 1,349 732
Variable lease cost 4,135 3,565 3,112
Sublease income (782) (669) (572)
Total lease cost $ 30,675 $ 33,318 $ 26,299