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Summary of Significant Accounting Policies - Leases - Estimated Future Lease Payments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
2019 (excluding the three months ended March 31, 2019) $ 251,699  
2020 308,267  
2021 280,931  
2022 257,598  
2023 234,035  
Thereafter 1,409,241  
Total minimum lease payments 2,741,771  
Less amounts representing interest or imputed interest (878,826)  
Present value of lease obligations 1,862,945  
2019 (excluding the three months ended March 31, 2019) (6,039)  
2020 (7,337)  
2021 (7,228)  
2022 (6,851)  
2023 (6,548)  
Thereafter (6,922)  
Total minimum lease payments (40,925)  
2019 (excluding the three months ended March 31, 2019) 59,411  
2020 68,333  
2021 59,710  
2022 49,997  
2023 39,643  
Thereafter 287,609  
Total minimum lease payments 564,703  
Present value of lease obligations (174,753)  
Present value of lease obligations $ 389,950  
2019   $ 323,454
2020   293,276
2021   267,379
2022   246,128
2023   221,808
Thereafter   1,287,807
Total minimum lease payments   2,639,852
2019   (7,525)
2020   (7,200)
2021   (7,063)
2022   (6,694)
2023   (6,409)
Thereafter   (6,279)
Total minimum lease payments   (41,170)
2019   80,513
2020   71,335
2021   61,269
2022   52,832
2023   44,722
Thereafter   377,750
Total minimum lease payments   688,421
Less amounts representing interest   (241,248)
Present value of finance lease obligations   $ 447,173