Goodwill and Intangible Assets, Net - Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 119,203	$ 17,204
Accumulated Amortization	(24,917)	(12,636)
Net Carrying Value	94,286	4,568	$ 6,318
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	103,926	10,666
Accumulated Amortization	(15,400)	(7,303)
Net Carrying Value	88,526	3,363	4,449
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,959	5,390
Accumulated Amortization	(8,427)	(4,342)
Net Carrying Value	5,532	1,048	1,486
Trade Name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,084	914
Accumulated Amortization	(856)	(757)
Net Carrying Value	228	157	273
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	234	234
Accumulated Amortization	(234)	(234)
Net Carrying Value	$ 0	$ 0	$ 110
Weighted-Average | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- average Remaining Life (years)	10 years 9 months 18 days	3 years 9 months 19 days
Weighted-Average | Developed Technology
Finite-Lived Intangible Assets [Line Items]
Weighted- average Remaining Life (years)	2 years 1 month 6 days	4 years 1 month 20 days
Weighted-Average | Trade Name
Finite-Lived Intangible Assets [Line Items]
Weighted- average Remaining Life (years)	3 years 3 months 18 days	4 years 3 months
Weighted-Average | Other
Finite-Lived Intangible Assets [Line Items]
Weighted- average Remaining Life (years)	0 days	0 days