Business Combinations, Enlighten (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Allocation of Total Purchase Price Consideration [Abstract]
Goodwill	$ 269,606	$ 269,383
Enlighten [Member]
Business Combinations [Abstract]
Date of acquisition	Dec. 04, 2015
Cash paid for acquisition	$ 11,300
Common stock issued	2,900
Net working capital settlement	700
Fair value estimate of additional earnings-based contingent consideration	2,200
Transaction costs	$ 500
Period to realize additional earnings-based contingent consideration	12 months
Allocation of Total Purchase Price Consideration [Abstract]
Acquired tangible assets	$ 5,200
Acquired intangible assets	4,300
Liabilities assumed	(2,500)
Goodwill	10,100
Total purchase price	17,100
Tax deductible amount of goodwill	$ 11,100
Enlighten [Member] | Minimum [Member]
Allocation of Total Purchase Price Consideration [Abstract]
Intangible assets estimated useful life	12 months
Enlighten [Member] | Maximum [Member]
Allocation of Total Purchase Price Consideration [Abstract]
Intangible assets estimated useful life	5 years