Business Acquisition (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 03, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Intangible assets including goodwill		$ 82,263		$ 82,263		$ 0
Consideration transferred, net of cash acquired				80,131	$ 0
Amortization of intangible assets acquired		13,745	$ 11,388	38,332	$ 33,684
Archway [Member]
Business Acquisition [Line Items]
Cash consideration transferred	$ 81,532
Maximum contingent purchase price payable by the Company	8,000
Intangible assets including goodwill	83,120
Net assets acquired	3,212
Contingent consideration	(4,800)
Cash acquired in acquisition	1,401
Consideration transferred, net of cash acquired	$ 80,131
Amount of purchase price placed in escrow		8,000		$ 8,000
Amortization of intangible assets acquired		$ 857