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Acquisitions Acquisitions (Purchase Price Breakdown) (Details) - USD ($) $ in Thousands			12 Months Ended
	Nov. 07, 2017	Nov. 30, 2016	Dec. 31, 2017	Dec. 31, 2018	Dec. 05, 2017	Dec. 31, 2016	Nov. 08, 2016	Sep. 20, 2016	May 31, 2016
Business Acquisition [Line Items]
Present value of future deferred payments		$ 2,000
Goodwill			$ 287,956	$ 303,887		$ 275,487
Longmont, Colorado [Member]
Business Acquisition [Line Items]
Assets Acquired (Excluding Goodwill)	$ 13,200
Payments to acquire businesses			2,300
Consideration transferred	29,200
Goodwill	16,000
Liabilities and Debt Assumed	0
Houston, Texas [Member]
Business Acquisition [Line Items]
Assets Acquired (Excluding Goodwill)									$ 1,500
Goodwill									$ 700
Madera, California [Member]
Business Acquisition [Line Items]
Assets Acquired (Excluding Goodwill)								$ 1,700
Goodwill								$ 700
Brooksfield, Wisconsin [Member]
Business Acquisition [Line Items]
Assets Acquired (Excluding Goodwill)							$ 12,500
Goodwill							$ 11,100
Loveland, Colorado [Member]
Business Acquisition [Line Items]
Assets Acquired (Excluding Goodwill)	2,500
Payments to acquire businesses			2,200
Goodwill	500
Liabilities and Debt Assumed	$ (200)
Long Island, New York [Member]
Business Acquisition [Line Items]
Assets Acquired (Excluding Goodwill)					$ 5,900
Payments to acquire businesses			$ 23,000
Goodwill					300
Liabilities and Debt Assumed					$ (200)

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