Acquisitions (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 09, 2015	Dec. 31, 2014
Rough Brothers Incorporated
Business Acquisition [Line Items]
Fair Value	$ 56,392
Rough Brothers Incorporated | Trademarks
Business Acquisition [Line Items]
Fair Value	13,550
Rough Brothers Incorporated | Technology
Business Acquisition [Line Items]
Fair Value	3,550
Rough Brothers Incorporated | Customer relationships
Business Acquisition [Line Items]
Fair Value	32,892
Rough Brothers Incorporated | Non-compete agreements
Business Acquisition [Line Items]
Fair Value	1,300
Rough Brothers Incorporated | Backlog
Business Acquisition [Line Items]
Fair Value	$ 5,100
Rough Brothers Incorporated | Maximum | Technology
Business Acquisition [Line Items]
Estimated Useful Life	15 years
Rough Brothers Incorporated | Maximum | Customer relationships
Business Acquisition [Line Items]
Estimated Useful Life	17 years
Rough Brothers Incorporated | Minimum | Technology
Business Acquisition [Line Items]
Estimated Useful Life	7 years
Rough Brothers Incorporated | Minimum | Customer relationships
Business Acquisition [Line Items]
Estimated Useful Life	11 years
Rough Brothers Incorporated | Minimum | Non-compete agreements
Business Acquisition [Line Items]
Estimated Useful Life	5 years
Rough Brothers Incorporated | Minimum | Backlog
Business Acquisition [Line Items]
Estimated Useful Life	6 months
2013 Acquisitions
Business Acquisition [Line Items]
Fair Value		$ 2,170
2013 Acquisitions | Trademarks
Business Acquisition [Line Items]
Fair Value		640
2013 Acquisitions | Technology
Business Acquisition [Line Items]
Fair Value		$ 260
Estimated Useful Life		15 years
2013 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Fair Value		$ 1,130
Estimated Useful Life		15 years
2013 Acquisitions | Non-compete agreements
Business Acquisition [Line Items]
Fair Value		$ 140
Estimated Useful Life		5 years