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Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Allowance for doubtful accounts: |  |  |  |  |  |
The roll forward of valuation accounts were as follows: |  |  |  |  |  |
Balance at beginning of period | $ 1,912 |  | $ 1,085 |  | $ 882 |
Charged to costs and expenses | 1,556 |  | 1,500 |  | 883 |
Deductions | (1,781) | [1] | (673) | [1] | (680) | [1]
Balance at end of period | 1,687 |  | 1,912 |  | 1,085 |
Allowance for excess and obsolete inventory: |  |  |  |  |  |
The roll forward of valuation accounts were as follows: |  |  |  |  |  |
Balance at beginning of period | 5,046 |  | 4,711 |  | 4,748 |
Charged to costs and expenses | 4,246 |  | 1,103 |  | 110 |
Deductions | (746) | [2] | (768) | [2] | (147) | [2]
Balance at end of period | 8,546 |  | 5,046 |  | 4,711 |
Valuation allowance for deferred tax assets: |  |  |  |  |  |
The roll forward of valuation accounts were as follows: |  |  |  |  |  |
Balance at beginning of period | 938 |  | 875 |  | 1,744 |
Charged to costs and expenses | 33,340 |  | 63 |  | 0 |
Deductions | 0 |  | 0 |  | (869) | [3]
Balance at end of period | $ 34,278 |  | $ 938 |  | $ 875 |
[1] | Uncollected receivables written off, net of recoveries and translation adjustment.
[2] | Disposal of excess and obsolete inventory and translation adjustment.
[3] | Capital loss carryforward written off.

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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 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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