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Segment Information (Revenues and Long-lived Assets by Geographic Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 398,185 $ 332,393  
Long-lived assets 923,396   $ 972,198
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 322,968 270,309  
Long-lived assets 844,109   918,125
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 19,474 16,570  
Ireland      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 15,425 13,003  
All other countries      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 40,318 $ 32,511  
Long-lived assets 79,287   $ 54,073
Assets held for sale $ 37,300