Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Leases
Operating lease cost	$ 14,783	$ 17,731
Short-term lease cost (1)	3,472	2,667
Amortization of right-of-use assets	17,829	17,904
Interest on lease liabilities	4,288	5,813
Total finance lease cost	22,117	23,717
Total lease costs	40,372	$ 44,115
Operating lease assets	$ 110,232		$ 104,271