Other Intangibles, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Summary of other intangible assets
Other Intangibles, Gross	$ 117,440
Accumulated Amortization	(100,704)
Other intangibles, net	16,736
Finite-Lived Other Intangible Assets, Gross
Gross, balance at beginning of period	117,987
Additions	490
Gross, translation adjustments	(1,037)
Gross, balance at end of period	117,440
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization, balance at beginning of period	(99,184)
Amortization	(2,368)
Accumulated amortization, translation adjustments	848
Accumulated Amortization, balance at end of period	(100,704)
Finite-Lived Intangible Assets, Net
Net, balance at beginning of period	18,803
Additions	490
Amortization	(2,368)
Net, translation adjustments	(189)
Net, balance at end of period	16,736
Developed technology
Summary of other intangible assets
Other Intangibles, Gross	72,271	72,575
Accumulated Amortization	(63,422)	(62,509)
Other intangibles, net	8,849	10,066
Finite-Lived Other Intangible Assets, Gross
Gross, balance at end of period	72,271	72,575
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization, balance at end of period	(63,422)	(62,509)
Finite-Lived Intangible Assets, Net
Net, balance at end of period	8,849	10,066
Product development costs
Summary of other intangible assets
Weighted Average Amortization Period	3 years	3 years
Other Intangibles, Gross	22,913	22,423
Accumulated Amortization	(19,834)	(19,314)
Other intangibles, net	3,079	3,109
Finite-Lived Other Intangible Assets, Gross
Gross, balance at beginning of period	22,423
Gross, balance at end of period	22,913	22,423
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization, balance at beginning of period	(19,314)
Accumulated Amortization, balance at end of period	(19,834)	(19,314)
Finite-Lived Intangible Assets, Net
Net, balance at beginning of period	3,109
Net, balance at end of period	3,079	3,109
Purchased technologies
Summary of other intangible assets
Weighted Average Amortization Period	5 years 1 month 6 days	5 years 1 month 6 days
Other Intangibles, Gross	49,358	50,152
Accumulated Amortization	(43,588)	(43,195)
Other intangibles, net	5,770	6,957
Finite-Lived Other Intangible Assets, Gross
Gross, balance at beginning of period	50,152
Gross, balance at end of period	49,358	50,152
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization, balance at beginning of period	(43,195)
Accumulated Amortization, balance at end of period	(43,588)	(43,195)
Finite-Lived Intangible Assets, Net
Net, balance at beginning of period	6,957
Net, balance at end of period	5,770	6,957
Other technologies
Summary of other intangible assets
Weighted Average Amortization Period	4 years 1 month 6 days
Other Intangibles, Gross	4,604
Accumulated Amortization	(4,167)
Other intangibles, net	437
Finite-Lived Other Intangible Assets, Gross
Gross, balance at beginning of period	45,412
Gross, balance at end of period	4,604
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization, balance at beginning of period	(36,675)
Accumulated Amortization, balance at end of period	(4,167)
Finite-Lived Intangible Assets, Net
Net, balance at beginning of period	8,737
Net, balance at end of period	437
Customer relationships
Summary of other intangible assets
Weighted Average Amortization Period	6 years 4 months 24 days	6 years 4 months 24 days
Other Intangibles, Gross	40,565	40,783
Accumulated Amortization	(33,115)	(32,577)
Other intangibles, net	7,450	8,206
Finite-Lived Other Intangible Assets, Gross
Gross, balance at beginning of period	40,783
Gross, balance at end of period	40,565	40,783
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization, balance at beginning of period	(32,577)
Accumulated Amortization, balance at end of period	(33,115)	(32,577)
Finite-Lived Intangible Assets, Net
Net, balance at beginning of period	8,206
Net, balance at end of period	7,450	8,206
Other intangibles
Summary of other intangible assets
Weighted Average Amortization Period		4 years 1 month 6 days
Other Intangibles, Gross	45,169	4,629
Accumulated Amortization	(37,282)	(4,098)
Other intangibles, net	7,887	531
Finite-Lived Other Intangible Assets, Gross
Gross, balance at end of period	45,169	4,629
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization, balance at end of period	(37,282)	(4,098)
Finite-Lived Intangible Assets, Net
Net, balance at end of period	$ 7,887	$ 531