Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies - Goodwill and Impairment of Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 6,636		$ 6,600	$ 6,636		$ 6,636
Business Acquisitions, Purchase Price Allocation, Subsequent Years, Remaining Adjustments			0
Goodwill impairment	$ 0	$ 0	106,200	$ 0	$ 106,205
Other Segments [Member]
Goodwill [Line Items]
Goodwill			0
Compression Division [Member]
Goodwill [Line Items]
Business Acquisitions, Purchase Price Allocation, Subsequent Years, Remaining Adjustments			92,400
Production Testing Division [Member]
Goodwill [Line Items]
Business Acquisitions, Purchase Price Allocation, Subsequent Years, Remaining Adjustments			$ 13,900
Fair Value, Measurements, Nonrecurring [Member] | Compression Division [Member]
Goodwill [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		7,900
Fair Value, Measurements, Nonrecurring [Member] | Production Testing Division [Member]
Goodwill [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		2,800
Fair Value, Measurements, Nonrecurring [Member] | Fluids Division [Member]
Goodwill [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		$ 300