Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finance lease expense:
Total lease expense	$ 42,162	$ 42,980
Operating Expenses
Operating lease expense:
Operating lease expense	4,448	4,052
Short-term and variable lease expense	8,804	11,814
Interest Expense, Net
Finance lease expense:
Interest expense on lease liabilities	24,821	24,603
Depreciation and Amortization Expense
Finance lease expense:
Amortization of ROU assets	$ 4,089	$ 2,511