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Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Constituents of accrued expenses |  |
Company bonuses | $ 8,721 | $ 7,354
Salaries, commissions, and payroll taxes | 5,769 | 5,765
Vacation | 4,109 | 3,699
Japanese retirement allowance | 3,559 | 3,204
Japanese consumption taxes | 2,984 | 1,858
Warranty obligations | 2,097 | 1,985
Other | 5,051 | 5,481
Total | 32,290 | 29,346
Changes in warranty obligations |  |
Beginning Balance | 1,985 | 1,377
Provisions for warranties issued during the period | 1,835 | 2,141
Fulfillment of warranty obligations | (1,664) | (1,506)
Foreign exchange rate changes | (59) | (27)
Ending Balance | $ 2,097 | $ 1,985

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