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Valuation Accounts | 12 Months Ended
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Dec. 31, 2011
Valuation Accounts [Abstract] |
Valuation Accounts | Schedule II - Valuation Accounts
|  |  |  |  | Additions |  |  |  |  |  |  |
|  | Balance at |  |  |  |  |  |  |  |  |  |  |  | Balance at |
|  | Beginning |  |  | Charges to |  |  |  |  |  |  |  |  | End of |
(in thousands) |  | of Period |  |  | Operations |  |  | Other |  |  | Deductions |  |  | Period |
Year ended December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts (1) |  | $ | 586 |  |  |  | 546 |  |  |  | (23 | ) |  |  | 15 |  |  |  | 1,094 |
Year ended December 31, 2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts (1) |  | $ | 417 |  |  |  | 385 |  |  |  | (29 | ) |  |  | 187 |  |  |  | 586 |
Year ended December 31, 2009: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts (1) |  | $ | 1,072 |  |  |  | (51 | ) |  |  | (6 | ) |  |  | 598 |  |  |  | 417 |
(1) | Deductions in the allowance for doubtful accounts represent write-offs, net of recoveries, of amounts determined to be uncollectible.

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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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