Income Taxes (Deferred Tax Liabilities (Assets)) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Capitalized software	$ 22,694	$ 17,303
Depreciation and amortization	15,535	15,858
Intangible assets	15,285	21,839
Inventory valuation and warranty provisions		1,000
Unrealized exchange gain		1,324
Unrealized gain on derivative instruments	1,827
Undistributed earnings of foreign subsidiaries	8,917	8,924
Gross deferred tax liabilities	64,258	66,248
Operating loss carryforwards	(65,230)	(108,073)
Vacation and other accruals	(6,744)	(5,963)
Inventory valuation and warranty provisions	(1,862)
Doubtful accounts and sales provisions	(919)	(1,209)
Unrealized exchange loss	(3,408)
Deferred revenue	(9,249)	(10,146)
Accrued legal expenses	(533)	(486)
Unrealized loss on derivative instruments		(2,756)
10% minority stock investment	(916)	(1,273)
Stock-based compensation	(6,043)	(5,824)
Research and development tax credit carryforward	(396)	(1,440)
Capital loss carryforward	(395)
Foreign tax credit carryforward	(203)	(320)
Cumulative translation adjustment on undistributed earnings	(393)
Other	(636)	(480)
Gross deferred tax assets	(96,927)	(137,970)
Valuation allowance	61,679	101,837
Net deferred tax liability	$ 29,010	$ 30,115

The tax effect as of the balance sheet date of the amount of the estimated future tax reductions attributable to a difference between the tax basis and the generally accepted accounting principles basis of a company's minority investment in its subsidiaries which will decrease future taxable income when such basis difference reverses.

No definition available.