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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

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