Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Other intangible assets:
Total intangible assets	$ 854,830	$ 858,174
Accumulated Amortization	(154,791)	(143,607)
Impairment	0	(2,600)
Net, finite-lived intangible assets	672,594
Total intangible assets, net	$ 700,039	711,967
Weighted average
Other intangible assets:
Useful life	14 years 8 months 12 days
Trade name
Other intangible assets:
Gross carrying amount, indefinite-lived	$ 25,445	28,507
Impairment	0	(2,600)
Net, indefinite-lived intangible assets	25,445	25,907
Impairment charge		2,600
Service provider network
Other intangible assets:
Gross carrying amount, indefinite-lived	2,000	2,000
Net, indefinite-lived intangible assets	2,000	2,000
Developed technology
Other intangible assets:
Gross carrying amount, finite-lived	759,248	759,290
Accumulated Amortization	(143,967)	(134,151)
Net, finite-lived intangible assets	$ 615,281	625,139
Developed technology | Weighted average
Other intangible assets:
Useful life	16 years
In-process research and development
Other intangible assets:
Gross carrying amount, finite-lived	$ 39,000	39,000
Accumulated Amortization	(5,597)	(5,055)
Net, finite-lived intangible assets	$ 33,403	33,945
In-process research and development | Weighted average
Other intangible assets:
Useful life	15 years 3 months 18 days
Customer relationships
Other intangible assets:
Gross carrying amount, finite-lived	$ 19,657	19,872
Accumulated Amortization	(1,619)	(2,198)
Net, finite-lived intangible assets	$ 18,038	17,674
Customer relationships | Weighted average
Other intangible assets:
Useful life	12 years 8 months 12 days
Software
Other intangible assets:
Gross carrying amount, finite-lived	$ 9,380	9,405
Accumulated Amortization	(3,563)	(2,161)
Net, finite-lived intangible assets	$ 5,817	7,244
Software | Weighted average
Other intangible assets:
Useful life	2 years 1 month 6 days
Other
Other intangible assets:
Gross carrying amount, finite-lived	$ 100	100
Accumulated Amortization	(45)	(42)
Net, finite-lived intangible assets	$ 55	$ 58
Other | Weighted average
Other intangible assets:
Useful life	3 years 3 months 18 days