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Stockholders' Equity - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income Tax Expense (Benefit) $ 3,746 $ (2,623) $ 10,851 $ 870
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     27  
Unrealized Gains on Investments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax     79 52
Income Tax Expense (Benefit)     (30) (20)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     49 32
Unrecognized Net Actuarial Loss and Prior Service Credit, Net        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax     (569) (705)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax     414 757
Income Tax Expense (Benefit)     133 (20)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     $ (22) $ 32