Annual report pursuant to Section 13 and 15(d)

Geographic Information (Details)

v3.10.0.1
Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-lived assets $ 466,937       $ 361,746       $ 466,937 $ 361,746  
Revenues 217,371 $ 205,375 $ 196,982 $ 167,410 211,133 $ 204,744 $ 166,665 $ 134,610 787,138 717,152 $ 651,227
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-lived assets 443,385       343,344       443,385 343,344  
Revenues                 734,748 665,793 588,791
Canada                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-lived assets 22,107       17,082       22,107 17,082  
Revenues                 36,728 42,186 49,706
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-lived assets $ 1,445       $ 1,320       1,445 1,320  
Revenues                 $ 15,662 $ 9,173 $ 12,730