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Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 1,258 $ 875 $ 769
Additions charged to costs and expenses 774 925 469
Deductions (651) (512) (386)
Other additions or deductions 14 (30) 23
Balance at end of period 1,395 1,258 875
Reserve for credit memos [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 369 338 226
Additions charged to costs and expenses 642 367 192
Deductions (367) (336) (80)
Other additions or deductions 0 0 0
Balance at end of period 644 369 338
Slow-moving and obsolete inventory reserves [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 5,875 5,607 5,539
Additions charged to costs and expenses 1,981 1,480 767
Deductions (828) (1,132) (859)
Other additions or deductions (255) (80) 160
Balance at end of period 6,773 5,875 5,607
Accrued product warranty [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 824 536 209
Additions charged to costs and expenses 1,384 1,968 403
Deductions (983) (1,467) (108)
Other additions or deductions 4 (213) 32
Balance at end of period 1,229 824 536
U.S. tax capital loss [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 2,053 2,056 2,132
Additions charged to costs and expenses 0 0 0
Deductions (19) (3) (76)
Other additions or deductions 0 0 0
Balance at end of period 2,034 2,053 2,056
U.S. foreign tax credits[Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period     392
Additions charged to costs and expenses     0
Deductions     (392)
Other additions or deductions     0
Balance at end of period     0
Foreign net operating loss tax carryforwards [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 1,062 937 868
Additions charged to costs and expenses 0 269 79
Deductions (760) (165) (56)
Other additions or deductions (7) 21 46
Balance at end of period $ 295 $ 1,062 $ 937