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Business Combinations Thermax Acquisition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Jul. 01, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 218,390 | $ 217,970 |  | $ 405,522
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 |  |  |  | $ 29,687 |
Business Combination, Consideration Transferred |  | $ 24,197 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  | 2,307 |
Working Capital Adjustment Payment | $ 1,383 |  |  |  |
Business Acquisition, Fair Value Of Net Assets Acquired Excluding Goodwill |  |  |  | 19,332 |
Goodwill |  |  |  | 10,355 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  | $ 10,000 |

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