Intangible Assets, Net - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finite-lived intangible assets:
Total finite-lived intangible assets	$ 275,230	$ 275,230
Accumulated amortization:
Total accumulated amortization	(243,541)	(237,697)
Total finite-lived intangible assets, net	31,689	37,533
Trade name (indefinite-lived)	31,646	31,646
Total intangible assets, net	63,335	69,179
Backlog
Finite-lived intangible assets:
Total finite-lived intangible assets	72,630	72,630
Accumulated amortization:
Total accumulated amortization	(72,630)	(72,630)
Customer Relationships
Finite-lived intangible assets:
Total finite-lived intangible assets	145,051	145,051
Accumulated amortization:
Total accumulated amortization	(113,584)	(110,636)
Developed Technologies
Finite-lived intangible assets:
Total finite-lived intangible assets	54,475	54,475
Accumulated amortization:
Total accumulated amortization	(54,475)	(51,751)
Other
Finite-lived intangible assets:
Total finite-lived intangible assets	3,074	3,074
Accumulated amortization:
Total accumulated amortization	$ (2,852)	$ (2,680)