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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of accumulated other comprehensive income (loss)    
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Beginning balance $ 382,400  
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Other comprehensive income before reclassifications (3,874)  
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Amounts reclassified from accumulated other comprehensive income (4,460)  
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Net Current-period other comprehensive income (8,334) 12,583
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Ending balance 374,066  
Defined Benefit Plans, Beginning balance (15,311)  
Defined Benefit Plans, Ending balance (15,311)  
Total, Beginning balance 367,089  
Total, Other comprehensive income before reclassifications (3,874)  
Total, Amounts reclassified from accumulated other comprehensive income (4,460)  
Total, Net Current-period other comprehensive income (8,334) 12,583
Total, Ending balance $ 358,755