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Business Combinations Thermax Acquisition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015 | Jul. 01, 2015
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 218,990 | $ 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 |  |  |  | $ 29,687
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 |  |  |  | 19,332
Goodwill |  |  |  | 10,355
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  | $ 10,000
Thermax [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Working Capital Adjustment Payment |  | $ 1,383 |  |

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