Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finance lease expense:
Amortization of ROU assets			$ 1,699	$ 1,332
Total lease expense	$ 33,950	$ 42,784	76,112	85,764
Operating expense
Operating lease expense:
Operating lease expense	4,432	4,273	8,880	8,325
Short-term and variable lease expense	563	11,251	9,367	23,065
Interest expense, net
Finance lease expense:
Interest expense on lease liabilities	24,886	24,632	49,707	49,235
Depreciation and amortization expense
Finance lease expense:
Amortization of ROU assets	$ 4,069	$ 2,628	$ 8,158	$ 5,139