Segment Data - Disaggregated Revenues, Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 101,946	$ 216,412	$ 266,496	$ 427,885
Mats and integrated services
Disaggregation of Revenue [Line Items]
Revenues	27,284	43,868	59,029	94,688
Mats and integrated services | Service revenues
Disaggregation of Revenue [Line Items]
Revenues	12,930	19,909	27,031	41,059
Mats and integrated services | Rental revenues
Disaggregation of Revenue [Line Items]
Revenues	9,170	17,675	22,672	39,255
Mats and integrated services | Product sales revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 5,184	$ 6,284	$ 9,326	$ 14,374