Goodwill and Intangible Assets - Goodwill Roll Forward (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Beginning balance, January 1	$ 33,798	$ 33,798
Additions	36,720	0
Ending balance	$ 70,518	$ 33,798