Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2017
Intangible assets
Weighted Average Remaining Amortization Period		7 years 3 months 18 days
Net Amount, Definite-lived intangible assets		$ 81,969
Total Gross Intangible Assets		550,119		$ 550,119
Accumulated Amortization and Impairment		464,970		180,276
Total Net Intangible Assets		85,149		369,843
Impairment charges, Definite-lived intangible assets	$ 216,400
In-process R&D
Intangible assets
Gross Carrying Amount, Indefinite-lived intangible assets		13,710		43,340
Accumulated Amortization and Impairment, Indefinite-lived intangible assets		10,530
Net Amount, Indefinite-lived intangible assets		$ 3,180		43,340
Impairment charges, Indefinite-lived intangible assets	$ 35,900
Technology
Intangible assets
Weighted Average Remaining Amortization Period		6 years 4 months 24 days
Gross Carrying Amount, Definite-lived intangible assets		$ 337,218		307,588
Accumulated Amortization and Impairment, Definite-lived intangible assets		290,808		133,121
Net Amount, Definite-lived intangible assets		$ 46,410		174,467
Impairment charges, Definite-lived intangible assets			$ 54,300
Customer relationships
Intangible assets
Weighted Average Remaining Amortization Period		10 years 2 months 12 days
Gross Carrying Amount, Definite-lived intangible assets		$ 164,595		164,595
Accumulated Amortization and Impairment, Definite-lived intangible assets		136,126		39,336
Net Amount, Definite-lived intangible assets		$ 28,469		125,259
Trademarks and tradenames
Intangible assets
Weighted Average Remaining Amortization Period		5 years 4 months 24 days
Gross Carrying Amount, Definite-lived intangible assets		$ 30,910		30,910
Accumulated Amortization and Impairment, Definite-lived intangible assets		23,899		4,321
Net Amount, Definite-lived intangible assets		$ 7,011		26,589
Other Intangible Assets
Intangible assets
Weighted Average Remaining Amortization Period		1 year 3 months 18 days
Gross Carrying Amount, Definite-lived intangible assets		$ 3,686		3,686
Accumulated Amortization and Impairment, Definite-lived intangible assets		3,607		3,498
Net Amount, Definite-lived intangible assets		$ 79		$ 188