Leases - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance lease cost:
Amortization of right-of-use assets	$ 7,222	$ 5,074
Interest on lease liabilities	7,060	6,044
Operating lease cost	129,399	90,980
Total lease cost	$ 143,681	$ 102,098