Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Other Intangible Assets (Schedule of Other Intangible Assets) (Details)

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Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 477,301 $ 477,705
Accumulated Amortization (335,179) (300,247)
Net Book Value 142,122 177,458
Developed Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 304,601 304,766
Accumulated Amortization (220,420) (198,632)
Net Book Value 84,181 106,134
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,708 19,009
Accumulated Amortization (14,279) (12,257)
Net Book Value 5,429 6,752
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 27,248 27,819
Accumulated Amortization (18,245) (16,849)
Net Book Value 9,003 10,970
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 106,203 106,571
Accumulated Amortization (63,435) (54,258)
Net Book Value 42,768 52,313
Capitalized Software Development Costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,541 19,540
Accumulated Amortization (18,800) (18,251)
Net Book Value $ 741 $ 1,289