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