Acquisitions (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Feb. 17, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Common stock issued in acquisition		$ 0	$ 43,530
Goodwill acquired during period		3,000
Additions to finite-lived intangible assets		1,000		$ 12,000
Ahmann and Martin Company [Member]
Business Acquisition [Line Items]
Common stock issued in acquisition	$ 48,000
Maximum contingent consideration	$ 8,000
Goodwill acquired during period				40,000
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Additions to finite-lived intangible assets		$ 1,012		$ 12,115