Income Taxes, Tax Carryforward and Other (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Tax Assets and Liabilities [Abstract]
Loss carryforwards	$ 21,092	$ 20,122
AMT credits	112	1,495
Foreign tax credits	0	446
Accrued employment expenses	1,256	718
Amortization and write-offs	8,883	10,557
Capitalized R&D costs	2,933	3,670
Deferred revenues	84	301
Depreciation	4,360	5,537
Doubtful accounts	3,499	2,121
Inventory reserves	822	0
Other accruals and reserves	228	617
Return allowances	5,660	4,118
Translation adjustments	61	0
Gross deferred tax asset	48,990	49,702
Less: valuation allowance	(11,910)	(10,075)
Net deferred tax asset	37,080	39,627
Among current assets	13,041	19,441
Among other non-current assets	24,039	20,186
Federal [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Loss carryforwards	$ 18,400