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Stockholders' Equity - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income Tax Expense (Benefit) $ (1,796) $ (2,940) $ (3,493) $ (6,576)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     (12)  
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     40 57
Income Tax Expense (Benefit)     (15) (21)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     25 36
Unrecognized Net Actuarial Loss and Service Credit
        
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     (413) [1] (584) [1]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax     353 [1] 453 [1]
Income Tax Expense (Benefit)     23 50
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     $ (37) $ (81)
[1] Amount included in pension expense. Refer to Note 16, Pension and Postretirement Benefits.