Leases - Future Minimum Lease Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
2019 (excluding the three months ended March 31, 2019)	$ 275,761
2020	352,916
2021	336,908
2022	336,660
2023	333,540
Thereafter	7,665,371
Total lease payments	9,301,156
Less: Amounts representing interest	(5,336,870)
Present value of future lease payments	3,964,286
Less: Current portion of lease obligations	(95,894)	$ (102,322)	$ 0
Long-term portion of lease obligations	3,868,392	3,704,334	0
Finance Leases
2019 (excluding the three months ended March 31, 2019)	15,701
2020	21,028
2021	21,021
2022	20,909
2023	20,083
Thereafter	398,727
Total lease payments	497,469
Less: Amounts representing interest	(274,647)
Present value of future lease payments	222,822
Less: Current portion of lease obligations	(5,874)	(5,752)	0
Long-term portion of lease obligations	216,948	218,329	0
Financing Obligations
2019 (excluding the three months ended March 31, 2019)	292,189
2020	374,715
2021	367,278
2022	367,278
2023	367,278
Thereafter	9,637,956
Total lease payments	11,406,694
Less: Amounts representing interest	(7,224,861)
Present value of future lease payments	4,181,833
Less: Current portion of lease obligations	(52,600)	(50,086)	(67,777)
Long-term portion of lease obligations	$ 4,129,233	$ 4,144,306	$ 7,080,638