Business Combinations, Zeon (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2016	Dec. 31, 2015
Business Combinations [Abstract]
Contingent consideration paid	[1]	$ 2,198	$ 5,904
Allocation of Total Purchase Price Consideration [Abstract]
Goodwill		$ 269,536	$ 269,383
Zeon [Member]
Business Combinations [Abstract]
Date of acquisition		Jan. 02, 2015
Cash paid for acquisition		$ 22,900
Common stock issued		11,400
Net working capital settlement		(1,500)
Fair value estimate of additional earnings-based contingent consideration		2,200
Contingent consideration paid		2,800
Transaction costs		$ 900
Period to realize additional earnings-based contingent consideration		12 months
Allocation of Total Purchase Price Consideration [Abstract]
Acquired tangible assets		$ 7,500
Acquired intangible assets		12,700
Liabilities assumed		(3,600)
Goodwill		18,400
Total purchase price		35,000
Tax deductible amount of goodwill		$ 18,500
Zeon [Member] | Minimum [Member]
Allocation of Total Purchase Price Consideration [Abstract]
Intangible assets estimated useful life		9 months
Zeon [Member] | Maximum [Member]
Allocation of Total Purchase Price Consideration [Abstract]
Intangible assets estimated useful life		8 years

[1] As of June 30, 2016, represents the fair value estimate of additional earnings-based contingent consideration that may be realized by Enlighten and Market Street's selling shareholders 12 months after the applicable acquisition. As of December 31, 2015, represents the fair value estimate of additional earnings-based contingent consideration that may be realized by Zeon, Enlighten and Market Street's selling shareholders 12 months after the applicable acquisition.