Description of Business - Adjustment to Goodwill Related to Brinderson Acquisition (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, net - beginning balance		$ 293,023
Goodwill, net - ending balance	$ 293,023	249,120	$ 293,023
Brinderson
Goodwill [Roll Forward]
Goodwill, net - beginning balance		76,248	77,248
Change in goodwill related to acquisitions	(1,000)	$ 1,000
Goodwill, net - ending balance	$ 76,248		$ 76,248