Leases - Future Minimum Lease Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
2019 (excluding the six months ended June 30, 2019)	$ 209,805
2020	408,009
2021	387,771
2022	384,825
2023	381,689
Thereafter	8,159,497
Total lease payments	9,931,596
Less: Amounts representing interest	(5,490,450)
Present value of future lease payments	4,441,146
Less: Current portion of lease obligations	(123,797)	$ (102,322)	$ 0
Long-term portion of lease obligations	4,317,349	3,704,334	0
Finance Leases
2019 (excluding the six months ended June 30, 2019)	10,749
2020	21,481
2021	21,474
2022	21,362
2023	20,497
Thereafter	403,820
Total lease payments	499,383
Less: Amounts representing interest	(273,694)
Present value of future lease payments	225,689
Less: Current portion of lease obligations	(6,214)	(5,752)	0
Long-term portion of lease obligations	219,475	218,329	0
Financing Obligations
2019 (excluding the six months ended June 30, 2019)	194,793
2020	374,715
2021	367,278
2022	367,278
2023	367,278
Thereafter	9,637,956
Total lease payments	11,309,298
Less: Amounts representing interest	(7,140,249)
Present value of future lease payments	4,169,049
Less: Current portion of lease obligations	(49,890)	(50,086)	(67,777)
Long-term portion of lease obligations	$ 4,119,159	$ 4,144,306	$ 7,080,638