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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Compensation and benefit accruals $ 1,521 $ 2,900
Inventory valuation 2,817 3,318
Federal and state net operating loss carryforwards 43,550 39,198
Deferred revenue 5,461 4,520
Accounts receivable allowance 121 138
Defined benefit pension plan 3,554 3,769
Foreign deferred revenue and other provisions 5,888 7,096
AMT credits 185 185
Other 135 1,457
Total 63,232 62,581
Domestic valuation allowance (48,196) (51,215)
Foreign valuation allowance (746) (1,492)
Total deferred tax assets 14,290 9,874
Deferred tax liabilities:    
Foreign subsidiaries - unrepatriated earnings (4,735) 0
Depreciation (4,413) (4,270)
Total deferred tax liabilities (9,148) (4,270)
Net deferred tax asset $ 5,142 $ 5,604