Income Taxes Income Taxes - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 26, 2018	Dec. 31, 2016
Operating Loss Carryforwards
Effective income tax rate (percent)		(67.00%)	17.40%	143.30%
Remeasurement of uncertain tax positions				$ 3,700
Deferred tax assets	$ 36,642	$ 36,642	$ 4,256
Deferred tax liabilities	1,289	1,289	2,842
Deferred tax assets net	131,521	131,521	51,953
Valuation allowances	822	822	45,439
Change in deferred tax asset valuation allowance	(39,600)	50,800
Tax benefit from adjustments to valuation allowance		50,200
Increase in deferred tax assets		50,200
Federal tax credit carryforward	1,500	1,500
Unrecognized tax benefits	18,453	18,453	19,560	21,400		$ 9,665
Unrecognized tax benefits that would impact tax rate if recognized	3,200	3,200	6,900	8,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2,100	2,100	2,200	1,600
Income tax interest and penalty expenses		(100)	700	1,400
Amount refunded	2,400	2,400	1,700
Decrease in uncertain tax positions		4,400	3,500
Anticipated decrease to unrecognized tax benefits	2,600	2,600
Tax cuts and jobs act, income tax expense (benefit)				53,400
Spinoff | Exterran Corporation
Operating Loss Carryforwards
Indemnification asset	8,508	8,508	7,063
Domestic
Operating Loss Carryforwards
Operating loss carryforwards	506,700	506,700
Operating loss carryforward not subject to expiration	267,400	267,400
State
Operating Loss Carryforwards
Operating loss carryforwards	202,100	202,100
Operating loss carryforward not subject to expiration	54,300	54,300
NOL valuation allowance	800	800	200
Net Operating Loss Carryforward
Operating Loss Carryforwards
Change in deferred tax asset valuation allowance		600
Other comprehensive income
Operating Loss Carryforwards
Tax cuts and jobs act, income tax expense (benefit)				300
Continuing Operations
Operating Loss Carryforwards
Increase in deferred tax assets		44,600
Tax cuts and jobs act, income tax expense (benefit)				57,700
Discontinued Operations
Operating Loss Carryforwards
Increase in deferred tax assets		5,600
Unrecognized tax benefits that would impact tax rate if recognized	$ 8,300	$ 8,300	$ 6,900	6,400
Tax cuts and jobs act, income tax expense (benefit)				$ 4,600
Partnership Merger
Operating Loss Carryforwards
Deferred tax assets acquired					$ 156,000
Deferred tax assets net					52,200
Valuation allowances					50,800
Partnership Merger | Continuing Operations
Operating Loss Carryforwards
Deferred tax assets net					46,600
Valuation allowances					45,200
Partnership Merger | Discontinued Operations
Operating Loss Carryforwards
Deferred tax assets net					5,600
Valuation allowances					$ 5,600