Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Accumulated impairment loss		$ 8,300
Aggregate amortization expense		19,300	$ 14,800	$ 14,900
Intangible asset impairment charges		$ 0	$ 0	$ 1,102
Ostial Solutions, LLC
Finite-Lived Intangible Assets [Line Items]
Intangible asset impairment charges	$ 1,100
Contingent consideration benefit	$ 900