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Operations by Business Segment and Geographic Information Geographic Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Revenues $ 1,024,791 $ 915,958 $ 845,678
Long-lived assets, net 271,555 264,011 245,166
United States      
Segment Reporting Information [Line Items]      
Revenues 949,317 847,540 775,870
Long-lived assets, net 251,181 242,118 224,727
Canada      
Segment Reporting Information [Line Items]      
Revenues 75,474 68,418 69,808
Long-lived assets, net $ 20,374 $ 21,893 $ 20,439