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Segment Data Segment Data - Disaggregated Revenues, Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues $ 216,412 $ 236,262 $ 427,885 $ 463,555
Operating segments | Mats and integrated services        
Disaggregation of Revenue [Line Items]        
Revenues 43,868 56,524 94,688 106,438
Operating segments | Mats and integrated services | Service revenues        
Disaggregation of Revenue [Line Items]        
Revenues 19,909 24,447 41,059 45,751
Operating segments | Mats and integrated services | Rental revenues        
Disaggregation of Revenue [Line Items]        
Revenues 17,675 20,938 39,255 39,750
Operating segments | Mats and integrated services | Product sales revenues        
Disaggregation of Revenue [Line Items]        
Revenues $ 6,284 $ 11,139 $ 14,374 $ 20,937