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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Schedule II Valuation and Qualifying Accounts Schedule II—Valuation and Qualifying Accounts
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Additions |
|  | December 31, 2010 |  |  | Charged to Expense |  |  | Charged to Other Accounts |  |  | Deductions |  |  | December 31, 2011 |
Allowance for doubtful accounts |  | $ | 490 |  |  | $ | 237 |  |  | $ | (2 | ) |  | $ | 42 |  |  | $ | 683 |
Inventory reserves |  |  | 3,781 |  |  |  | 1,537 |  |  |  | 1,074 |  |  |  | 1,233 |  |  |  | 5,159 |
Warranty reserves |  |  | 1,314 |  |  |  | 591 |  |  |  | — |  |  |  | 1,066 |  |  |  | 839 |
Deferred tax valuation allowance |  |  | 26,260 |  |  |  | 496 |  |  |  | — |  |  |  | 231 |  |  |  | 26,525 |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Additions |
|  | December 31, 2009 |  |  | Charged to Expense |  |  | Charged to Other Accounts |  |  | Deductions |  |  | December 31, 2010 |
Allowance for doubtful accounts |  | $ | 1,024 |  |  | $ | (216 | ) |  | $ | (7 | ) |  | $ | 311 |  |  | $ | 490 |
Inventory reserves |  |  | 3,990 |  |  |  | 387 |  |  |  | (10 | ) |  |  | 586 |  |  |  | 3,781 |
Warranty reserves |  |  | 1,211 |  |  |  | 602 |  |  |  | — |  |  |  | 499 |  |  |  | 1,314 |
Deferred tax valuation allowance |  |  | 25,775 |  |  |  | (115 | ) |  |  | — |  |  |  | (600 | ) |  |  | 26,260 |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Additions |
|  | December 31, 2008 |  |  | Charged to Expense |  |  | Charged to Other Accounts |  |  | Deductions |  |  | December 31, 2009 |
Allowance for doubtful accounts |  | $ | 1,086 |  |  | $ | 188 |  |  | $ | (42 | ) |  | $ | 208 |  |  | $ | 1,024 |
Inventory reserves |  |  | 2,850 |  |  |  | 1,123 |  |  |  | 17 |  |  |  | — |  |  |  | 3,990 |
Warranty reserves |  |  | 1,026 |  |  |  | 436 |  |  |  | — |  |  |  | 251 |  |  |  | 1,211 |
Deferred tax valuation allowance |  |  | 23,605 |  |  |  | 360 |  |  |  | — |  |  |  | (1,810 | ) |  |  | 25,775 |

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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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