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Finacial Statement Schedule Allowance For Uncollectible Accounts (Tables) | 12 Months Ended
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Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets [Table Text Block] |
Description |  | Balance at Beginning of Year |  | Additions Charged to Costs and Expenses (a) |  | Deduction (b) |  | Balance at End of Year
ALLOWANCE FOR UNCOLLECTIBLE ACCOUNTS: |  |  |  |  |  |  |  |  |  |  |  |
2009 |  | $ | (505 | ) |  | $ | (214 | ) |  | $ | 178 |  |  | $ | (541 | )
2010 |  | (541 | ) |  | (193 | ) |  | 141 |  |  | (593 | )
2011 |  | (593 | ) |  | (12 | ) |  | 141 |  |  | (464 | )
(a) We record a bad debt provision based upon historical experience and a review of individual customer balances. (b) When an individual customer balance becomes impaired and is deemed uncollectible a deduction is made against the allowance for uncollectible accounts. Years Ended December 31, 2011, 2010 and 2009 (In thousands)
Description |  | Balance at Beginning of Year |  | Additions Charged to Costs and Expenses (c) |  | Deduction |  | Balance at End of Year
TAX VALUATION ALLOWANCE: |  |  |  |  |  |  |  |  |  |  |  |
2009 |  | — |  |  | — |  |  | — |  |  | — |
2010 |  | — |  |  | — |  |  | — |  |  | — |
2011 |  | — |  |  | (361 | ) |  | — |  |  | (361 | )
(c) We record a valuation allowance against a deferred tax asset when it is determined that it is more likely than not that the deferred tax asset will not be realized.

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- Definition Tabular disclosure of the activity by class in any valuation allowance for impairment of recognized servicing assets - including beginning and ending balances, aggregate additions charged and recoveries credited to operations, and aggregate write-downs charged against allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph g(5) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6863725&loc=d3e122739-111746 + Details
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