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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2012
Valuation and Qualifying Accounts | Schedule II-A—Valuation and Qualifying Accounts Allowance for Doubtful Accounts Receivable (in thousands)
Fiscal Year Ended |  | Balance at Beginning |  |  | Additions Charged to |  |  | Deductions |  |  | Balance at End of Period |
| of Period |  |  | Costs and Expenses |  |  | Other |  |  |
December 31, 2012 |  | $ | 340 |  |  |  | — |  |  | $ | 283 |  |  |  | — |  |  | $ | 623 |
December 31, 2011 |  | $ | 447 |  |  |  | — |  |  | $ | (107 | ) |  |  | — |  |  | $ | 340 |
December 31, 2010 |  | $ | 636 |  |  |  | — |  |  | $ | (189 | ) |  |  | — |  |  | $ | 447 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + 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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Period Type: | duration