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Summary of Significant Accounting Policies (Prior Period Adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Spare parts and equipment sales	$ 17,502	$ 12,986
Gain (loss) on sale of leased equipment	9,570	545
Cost of spare parts and equipment sales	14,412	11,388
Cash flows provided by operating activities	35,628	35,281
Cash flows provided by financing activities	(42,250)	91,683
Impacts from ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Spare parts and equipment sales		6,700
Gain (loss) on sale of leased equipment		(100)
Cost of spare parts and equipment sales		6,600
Cash flows provided by operating activities		$ 4,900
Cash flows provided by financing activities	$ (4,500)

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

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Revenue during the period from the sale of spare parts in the normal course of business.

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