Acquisitions, Intangible Assets and Goodwill - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Acquisition intangible assets, net, Gross Carrying Amount	$ 91,125	$ 75,775
Acquisition intangible assets, net, Accumulated Amortization	(69,669)	(66,451)
Acquisition intangible assets, net, Net Carrying Amount	21,456	9,324
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Acquisition intangible assets, net, Gross Carrying Amount	50,613	47,696
Acquisition intangible assets, net, Accumulated Amortization	(43,511)	(42,410)
Acquisition intangible assets, net, Net Carrying Amount	7,102	5,286
Trade Name
Finite Lived Intangible Assets [Line Items]
Acquisition intangible assets, net, Gross Carrying Amount	7,301	6,072
Acquisition intangible assets, net, Accumulated Amortization	(6,003)	(5,796)
Acquisition intangible assets, net, Net Carrying Amount	1,298	276
Technology
Finite Lived Intangible Assets [Line Items]
Acquisition intangible assets, net, Gross Carrying Amount	33,211	22,007
Acquisition intangible assets, net, Accumulated Amortization	(20,155)	(18,245)
Acquisition intangible assets, net, Net Carrying Amount	$ 13,056	$ 3,762