Income Taxes (Deferred Tax Liabilities (Assets)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Capitalized software	$ 7,748	$ 7,432
Depreciation and amortization	15,550	15,404
Intangible assets	18,843	9,920
Unrealized gain on derivative instruments	898	709
Undistributed earnings of foreign subsidiaries	8,565	8,437
Gross deferred tax liabilities	51,604	41,902
Operating loss carryforwards	(108,297)	(86,285)
Vacation and other accruals	(5,147)	(5,895)
Inventory valuation and warranty provisions	(12,813)	(11,773)
Doubtful accounts and sales provisions	(1,101)	(1,229)
Unrealized exchange loss	(2,192)	(1,664)
Deferred revenue	(7,809)	(3,987)
Accrued rent expenses	(453)	(219)
10% minority stock investment	(908)	(932)
Stock-based compensation	(6,069)	(5,471)
Research and development tax credit carryforward	(2,758)	(2,421)
Foreign tax credit carryforward	(4)
Other	(444)	(561)
Gross deferred tax assets	(147,995)	(120,437)
Valuation allowance	103,778	91,649
Net deferred tax liability	$ 7,387	$ 13,114