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Supplemental Comprehensive Income Disclosures (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Beginning Balance $ (20,588) $ 1,259
Other comprehensive income (loss) before reclassification adjustment 8,096 (1,568)
Amounts reclassified from accumulated other comprehensive income (loss) 0 (3)
Total other comprehensive (loss) income 8,096 (1,571)
Accumulated Other Comprehensive Income (Loss), Ending Balance (12,492) (312)
Accumulated Defined Benefit Plans Adjustment [Member]
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Beginning Balance 280 138
Other comprehensive income (loss) before reclassification adjustment 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Total other comprehensive (loss) income 0 0
Accumulated Other Comprehensive Income (Loss), Ending Balance 280 138
Accumulated Net Unrealized Investment Gain (Loss) [Member]
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Beginning Balance (20,868) 1,121
Other comprehensive income (loss) before reclassification adjustment 8,096 (1,568)
Amounts reclassified from accumulated other comprehensive income (loss) 0 (3)
Total other comprehensive (loss) income 8,096 (1,571)
Accumulated Other Comprehensive Income (Loss), Ending Balance $ (12,772) $ (450)