Business Segment Information - Financial Information with Respect to Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating revenues	$ 197,202	$ 234,665
Direct operating costs	(151,842)	(181,316)
Segment profits	45,360	53,349
Depreciation and amortization	27,498	30,235
Capital expenditures including ARO additions	24,034	21,251
Identifiable assets	743,220	811,565	$ 761,777
Corporate and Other
Segment Reporting Information [Line Items]
Operating revenues	0	0
Direct operating costs	0	0
Segment profits	0	0
Depreciation and amortization	1,768	2,057
Capital expenditures including ARO additions	272	433
Identifiable assets	295,398	315,810
Completion & Remedial Services
Segment Reporting Information [Line Items]
Operating revenues	76,834	117,597
Completion & Remedial Services \| Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	76,834	117,597
Direct operating costs	(63,433)	(89,659)
Segment profits	13,401	27,938
Depreciation and amortization	13,193	14,260
Capital expenditures including ARO additions	10,008	11,517
Identifiable assets	229,004	255,067
Well Servicing
Segment Reporting Information [Line Items]
Operating revenues	60,515	56,951
Well Servicing \| Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	60,515	56,951
Direct operating costs	(47,196)	(46,511)
Segment profits	13,319	10,440
Depreciation and amortization	5,295	5,700
Capital expenditures including ARO additions	6,238	6,705
Identifiable assets	102,033	109,279
Water Logistics
Segment Reporting Information [Line Items]
Operating revenues	55,601	56,509
Water Logistics \| Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	55,601	56,509
Direct operating costs	(37,299)	(40,923)
Segment profits	18,302	15,586
Depreciation and amortization	6,968	7,726
Capital expenditures including ARO additions	7,510	2,189
Identifiable assets	112,533	123,599
Other Services
Segment Reporting Information [Line Items]
Operating revenues	4,252	3,608
Other Services \| Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	4,252	3,608
Direct operating costs	(3,914)	(4,223)
Segment profits	338	(615)
Depreciation and amortization	274	492
Capital expenditures including ARO additions	6	407
Identifiable assets	$ 4,252	$ 7,810

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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