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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

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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