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Segment and Geographic Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Number of operating segments | segment                 1    
Total Revenue $ 358,025 $ 340,340 $ 321,479 $ 307,050 $ 307,216 $ 308,616 $ 255,993 $ 263,852 $ 1,326,894 $ 1,135,677 $ 1,102,924
Total Right-of-Use Assets, net 152,239               152,239    
Total Property and Equipment, net 51,725       53,229       51,725 53,229  
U.S.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Revenue                 1,098,975 1,005,948 1,069,567
Total Right-of-Use Assets, net 129,322               129,322    
Total Property and Equipment, net         42,666         42,666  
Non-U.S.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Revenue                 227,919 129,729 $ 33,357
Total Right-of-Use Assets, net $ 22,917               $ 22,917    
Total Property and Equipment, net         $ 10,563         $ 10,563