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Valuation And Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Allowance For Doubtful Accounts [Member]
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at beginning of year | $ 53 | $ 58 | $ 207 |
| Additions charged to costs and expenses | 367 | 153 | 69 |
| Deductions | 211 | 158 | 218 |
| Balance at end of year | 209 | 53 | 58 |
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Tax Valuation Allowance [Member]
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at beginning of year | 38,461 | 54,513 | 59,603 |
| Deductions | 558 | 16,052 | 5,090 |
| Balance at end of year | $ 37,903 | $ 38,461 | $ 54,513 |