Annual report pursuant to Section 13 and 15(d)

Financial Instruments (Assets measured at fair value on a recurring basics) (Details)

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Financial Instruments (Assets measured at fair value on a recurring basics) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred Compensation Plan Assets (mutual funds) $ 1,758 $ 1,600
Total Assets, at fair value $ 1,758 $ 1,600