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Segment Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Number of operating segments | item                 1    
Total revenues $ 528,402 $ 449,683 $ 521,516 $ 382,282 $ 444,156 $ 381,534 $ 326,444 $ 384,082 $ 1,881,883    
Property and equipment, net 319,751       259,763       319,751 $ 259,763  
U.S.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenues                 1,800,000 1,500,000 $ 1,100,000
Property and equipment, net 252,500       252,400       252,500 252,400  
Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenues                 79,900 66,900 $ 29,600
Property and equipment, net $ 67,300       $ 7,400       $ 67,300 $ 7,400