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Concentration of Credit Risk and Significant Relationships (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Concentration Risk [Line Items]      
Revenue from Contracts with Customers $ 899,567 $ 798,952 $ 828,635
Total long-lived assets 115,178 126,650  
U.S.      
Concentration Risk [Line Items]      
Revenue from Contracts with Customers 748,327 666,650 698,994
Total long-lived assets 111,171 121,146  
Non-U.S.      
Concentration Risk [Line Items]      
Revenue from Contracts with Customers 151,240 132,302 $ 129,641
Total long-lived assets $ 4,007 $ 5,504