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Acquisitions Business Combinations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill, Acquired During Period	$ 41,308	$ 9,773
Amortization of Intangible Assets	8,300	$ 6,300	$ 6,500
Henry Troemner, LLC [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	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
Minimum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Other Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 15,600
Goodwill, Acquired During Period	7,500
Finite-lived Intangible Assets Acquired	$ 9,400
Maximum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Minimum [Member] | Henry Troemner, LLC [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Customer Relationships [Member] | Henry Troemner, LLC [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 43,900
Technology-Based Intangible Assets [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
Maximum [Member] | Henry Troemner, LLC [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	25 years
Trade Names [Member] | Henry Troemner, LLC [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 3,400

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- Definition

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