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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