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Business Combinations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 13,900 |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 109,681 | $ 10,969
Goodwill, Acquired During Period |  |  | 5,800 |
Finite-lived Intangible Assets Acquired |  |  | 7,700 |
Amortization of Intangible Assets | $ 2,200 | $ 1,500 | 5,800 | $ 4,700
Henry Troemner, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  |  | 95,800 |
Goodwill, Acquired During Period |  |  | 33,800 |
Amortization of Intangible Assets |  |  | 2,700 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 11,300 |  | 11,300 |
Customer Relationships [Member] | Henry Troemner, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 43,900 |
Proven technology and patents [Member] | Henry Troemner, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 2,900 |
Other Intangible Assets [Member] | Henry Troemner, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 500 |
Minimum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 10 years |
Minimum [Member] | Henry Troemner, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 3 years |
Maximum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 15 years |
Maximum [Member] | Henry Troemner, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 25 years |
Tradename [Member] | Henry Troemner, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  | $ 3,400 |

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