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Related Party Transactions - Transactions with Joint Ventures (Details) - USD ($) $ in Thousands				3 Months Ended								12 Months Ended
	May 31, 2017	Apr. 13, 2016	Dec. 07, 2012	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Other (income) expense, net				$ 225	$ 9	$ (2,142)	$ (453)	$ (146)	$ (62)	$ (92)	$ (59)	$ (2,361)	$ (359)	$ (144)	$ 283
Corporate Joint Venture
Related Party Transaction [Line Items]
Other (income) expense, net													$ 400	100	$ (300)
Doosan-PSI, LLC | Corporate Joint Venture
Related Party Transaction [Line Items]
Investment amount with related party														$ 1,000
Percent of noncontrolling interest														50.00%
MAT-PSI Holdings, LLC | Green Power | Corporate Joint Venture
Related Party Transaction [Line Items]
Ownership percentage			100.00%
Investment amount with related party			$ 900
Percent of noncontrolling interest			50.00%
SW | Sterling And Wilson Cogen Solutions, LLC | Corporate Joint Venture
Related Party Transaction [Line Items]
Investment amount with related party	$ 200	$ 200
Percent of noncontrolling interest	49.00%	49.00%

X

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

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- Definition

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+ References

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Amount of income (expense) related to nonoperating activities, classified as other.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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Amount of transactions with related party during the financial reporting period.

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-Topic 850
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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