Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 23,128	$ 11,972
Finance lease cost
Amortization of leased assets	51,223	49,778
Interest on lease liabilities	50,188	52,839
Variable lease cost	30,776	27,997
Sublease income	(4,021)	(6,391)
Net lease cost	$ 151,294	$ 136,195