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Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements      
Practical Expedients Package true    
Operating lease assets $ 821,025    
Operating lease liabilities 877,796    
Property and equipment, net 376,172   $ 359,855
Deferred revenues and gains, current portion 84,247   88,054
Accrued liabilities 163,180   124,619
Other long-term liabilities $ 27,294   $ 79,958
ASU 2016-02 | Adjustment      
New Accounting Pronouncements      
Operating lease assets   $ 809,700  
Operating lease liabilities   867,500  
Property and equipment, net   (4,900)  
Deferred revenues and gains, current portion   (10,600)  
Accrued liabilities   (7,600)  
Other long-term liabilities   (54,500)  
ASU 2016-02 | Adjustment | Retained Earnings (Deficit)      
New Accounting Pronouncements      
Cumulative-effect adjustment   3,700  
ASU 2016-02 | Adjustment | Non-controlling Interest      
New Accounting Pronouncements      
Cumulative-effect adjustment   $ 6,300