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Stockholders' Equity (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of reclassification adjustments    
Unrealized gains on investments $ (27) $ (48)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax 9 18
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax (18) (30)
Recognized net actuarial loss 290 284
Amortization of prior service credit (225) (278)
Other Comprehensive Income Loss Pension and Other Postretirement Benefit Plans Prior Service Cost Recognized and Gain Loss Recognized In Net Periodic Benefit Cost Reclassification Adjustment Tax (24) (3)
Other comprehensive income loss pension and other postretirement benefit plans, cost reclassification adjustment net of tax, income tax expense $ 41 $ 3