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Summary of Significant Accounting Policies - Prior Period Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Spare parts and equipment sales	$ 14,586	$ 11,653	$ 32,088	$ 24,639
Gain (loss) on sale of leased equipment	5,120	52	14,690	597
Cost of spare parts and equipment sales	$ 12,585	10,305	26,997	21,692
Cash flows provided by operating activities			91,541	81,977
Cash flows provided by financing activities			(60,909)	133,208
Impacts from ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Spare parts and equipment sales		4,600		11,300
Gain (loss) on sale of leased equipment		(200)		(300)
Cost of spare parts and equipment sales		$ 4,400		11,000
Cash flows provided by operating activities				$ 9,300
Cash flows provided by financing activities			$ (9,300)

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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