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Segment and Geographical Information - Long Lived Assets and Continuing Operations by Country (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]          
Revenues $ 467,815 $ 413,696 $ 927,737 $ 818,860  
Income (loss) before income taxes 113,765 96,389 196,727 171,230  
Long-lived assets 26,668   26,668   $ 28,099
United States [Member]          
Revenues From External Customers And Long Lived Assets [Line Items]          
Revenues 395,710 349,388 779,504 689,182  
Income (loss) before income taxes 94,100 77,511 157,314 135,543  
Long-lived assets 26,122   26,122   27,443
Canada [Member]          
Revenues From External Customers And Long Lived Assets [Line Items]          
Revenues 72,105 64,308 148,233 129,678  
Income (loss) before income taxes 19,665 $ 18,878 39,413 $ 35,687  
Long-lived assets $ 546   $ 546   $ 656