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Business Combinations Thermax Acquisition (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Jul. 01, 2015
Business Acquisition [Line Items] |  |  |
Goodwill | $ 219,258 | $ 218,390 |
Thermax [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00%
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  | $ 29,684
Business Combination, Consideration Transferred | $ 24,197 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 2,307
Business Acquisition, Fair Value Of Net Assets Acquired Excluding Goodwill |  |  | 19,264
Goodwill |  |  | 10,420
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 10,000

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