Intangible Assets Schedule of other intangible assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 53,448	$ 68,883
Effects of changes in exchange rates	1,159	955
Impairment of Intangible Assets, Finite-lived		(31,873)
Accumulated amortization	(20,431)	(18,554)
Net carrying amount	34,176
Technology-based [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	31,722	50,368
Effects of changes in exchange rates	516	441
Impairment of Intangible Assets, Finite-lived		(26,168)
Accumulated amortization	(15,502)	(14,712)
Net carrying amount	16,736	9,929
Weighted-average useful life, in years	7 years 0 months	4 years 0 months
Trademarks and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	21,726	18,515
Effects of changes in exchange rates	643	514
Impairment of Intangible Assets, Finite-lived		(5,705)
Accumulated amortization	(4,929)	(3,842)
Net carrying amount	$ 17,440	$ 9,482
Weighted-average useful life, in years	7 years 0 months	7 years 0 months