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Investments (Net Realized Gains (Losses) on Invesments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Gain (Loss) on Investments [Line Items]                      
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses $ 16,364 $ (2,077) $ 15,689 $ 10,585 $ 1,471 $ (1,238) $ (611) $ (6,076) $ 40,561 $ (6,454) $ (18,641)
Fixed Maturity Securities [Member]
                     
Gain (Loss) on Investments [Line Items]                      
Gross realized gains                 39,079 10,906 12,614
Gross realized losses                 (6,170) (562) (1,423)
Gross realized gains (losses), excluding other than temporary impairments                 32,909 10,344 11,191
Equity Securities [Member]
                     
Gain (Loss) on Investments [Line Items]                      
Gross realized gains                 9,571 562 966
Other Investments [Member]
                     
Gain (Loss) on Investments [Line Items]                      
Gain on sale of real estate                 2,144 5,149 377
Loss on sale of real estate                 (1,317) 0 0
Impairment losses on real estate                 (1,195) (5,677) (405)
Gain (loss) on other investments                 (368) (528) (28)
Mortgage Loans on Real Estate [Member]
                     
Gain (Loss) on Investments [Line Items]                      
Mortgage loans on real estate: Increase in allowance for credit losses                 (5,621) (16,832) (30,770)
Mortgage loans on real estate: recovery of specific allowance                 4,070 0 0
Mortgage loans on real estate: change in allowance for provision and recoveries                 $ (1,551) $ (16,832) $ (30,770)