Acquisitions (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business combinations, provisional information, initial accounting incomplete, items	The Company acquired several businesses during 2014, as discussed below. As of December 31, 2014, determination of the fair values of the net assets acquired, including the estimated values of contingent earn-out obligations and the estimated useful lives of acquired assets for certain of these acquisitions, were provisional and remained preliminary. Management continues to assess the valuation of these items and any ultimate purchase price adjustments that may result based on the final net assets and net working capital of the acquired businesses, as prescribed in the corresponding purchase agreements.
Business combinations, provisional information, initial accounting incomplete, reasons	The Company will revise its preliminary estimates of the fair values of net assets acquired if new information is obtained about the facts and circumstances existing as of the date of acquisition, or for purchase price adjustments, based on the final net assets and net working capital of the acquired business, as prescribed in the applicable purchase agreement.