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Business Combinations Hetsco Acquisition (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Jan. 13, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Goodwill | $ 228,352 |  | $ 217,970
Hetsco [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |
Business Combination, Consideration Transferred | $ 23,162 |  |
Business Acquisition, Fair Value Of Net Assets Acquired Excluding Goodwill |  | $ 13,042 |
Goodwill |  | 10,120 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 8,400 |

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