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Assets - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Intangible Assets
Asset Impairment Charges	$ 252,343	$ 675	$ 252,343	$ 1,138
Gross Carrying Amount	550,119		550,119		$ 550,119
Accumulated Amortization and Impairment	456,537		456,537		180,276
Net Amount	86,142		86,142
Total Net Intangible Assets	93,582		93,582		369,843
Definite-lived intangible assets
Intangible Assets
Accumulated Amortization and Impairment	216,400		216,400
Technology
Intangible Assets
Gross Carrying Amount	307,588		307,588		307,588
Accumulated Amortization and Impairment	260,471		260,471		133,121
Net Amount	47,117		47,117		174,467
Customer relationships
Intangible Assets
Gross Carrying Amount	164,595		164,595		164,595
Accumulated Amortization and Impairment	133,393		133,393		39,336
Net Amount	31,202		31,202		125,259
In-process research and development
Intangible Assets
Gross Carrying Amount	43,340		43,340		43,340
Accumulated Amortization and Impairment	35,900		35,900
Net Amount	7,440		7,440		43,340
Trademark and tradenames
Intangible Assets
Gross Carrying Amount	30,910		30,910		30,910
Accumulated Amortization and Impairment	23,221		23,221		4,321
Net Amount	7,689		7,689		26,589
Other
Intangible Assets
Gross Carrying Amount	3,686		3,686		3,686
Accumulated Amortization and Impairment	3,552		3,552		3,498
Net Amount	$ 134		$ 134		$ 188