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Schedule II Valuation of Qualifying Accounts and Reserves (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation Allowances and Reserves, Balance Beginning of Period | $ 791 | $ 775 | $ 775
Valuation Allowances and Reserves, Charged to Cost and Expense | 205 | 83 | 3
Valuation Allowances and Reserves, Charged to Other Accounts | 0 | 0 | 0
Valuation Allowances and Reserves, Deductions | 167 | 67 | 3
Valuation Allowances and Reserves, Balance End of Period | $ 829 | $ 791 | $ 775

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