Goodwill and Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets
Weighted Average Remaining Amortization Period	10 years 2 months 12 days
Gross Carrying Amount	$ 308,213	$ 228,153
Accumulated Amortization and Impairment	148,905	113,437
Net Amount	159,308	114,716
Estimated aggregate amortization expense
2015	27,003
2016	20,969
2017	18,100
2018	16,492
2019	15,235
Thereafter	58,609
Net Amount	156,408
Amortization expense for other intangible assets	13,146	5,527	4,908
Technology
Intangible Assets
Weighted Average Remaining Amortization Period	9 years 7 months 6 days
Gross Carrying Amount	222,358	182,408
Accumulated Amortization and Impairment	106,342	97,524
Net Amount	116,016	84,884
Customer relationship
Intangible Assets
Weighted Average Remaining Amortization Period	13 years 10 months 24 days
Gross Carrying Amount	69,350	35,040
Accumulated Amortization and Impairment	35,549	14,721
Net Amount	33,801	20,319
Trademarks and tradenames
Intangible Assets
Weighted Average Remaining Amortization Period	3 years 6 months
Gross Carrying Amount	3,050	1,970
Accumulated Amortization and Impairment	1,096	763
Net Amount	1,954	1,207
Indefinite-lived trademark [member]
Intangible Assets
Gross Carrying Amount	2,900	2,900
Net Amount	2,900	2,900
IPR&D
Intangible Assets
Gross Carrying Amount	5,070	5,070
Accumulated Amortization and Impairment	5,070
Net Amount		5,070
Other Intangible Assets
Intangible Assets
Weighted Average Remaining Amortization Period	1 year 1 month 6 days
Gross Carrying Amount	5,485	765
Accumulated Amortization and Impairment	848	429
Net Amount	$ 4,637	$ 336