Leases - Maturities of Operating and Financing Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finance Leases
Remainder of 2019	$ 61,339
2020	88,998
2021	87,365
2022	85,016
2023	84,092
Thereafter	512,804
Total lease payments	919,614
Less: amount representing interest	(323,508)
Present value of lease liabilities	596,106	$ 596,638
Operating Leases
Remainder of 2019	7,331
2020	10,366
2021	8,658
2022	8,233
2023	8,151
Thereafter	46,212
Total lease payments	88,951
Less: amount representing interest	(17,947)
Present value of lease liabilities	71,004
Total
Remainder of 2019	68,670
2020	99,364
2021	96,023
2022	93,249
2023	92,243
Thereafter	559,016
Total lease payments	1,008,565
Less: amount representing interest	(341,455)
Present value of lease liabilities	$ 667,110