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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gain (Loss) on Investments [Line Items]                      
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses $ (151) $ 1,159 $ 4,324 $ 4,879 $ 2,131 $ (3,190) $ (2,230) $ (714) $ 10,211 $ (4,003) $ 40,561
Fixed Maturity Securities [Member]                      
Gain (Loss) on Investments [Line Items]                      
Available for sale securities: gross realized gains                 7,230 3,273 39,079
Available for sale securities: gross realized losses                 (5,787) (1,006) (6,170)
Available for sale securities: gross realized gains (losses), excluding other than temporary impairments                 1,443 2,267 32,909
Equity Securities [Member]                      
Gain (Loss) on Investments [Line Items]                      
Available for sale securities: gross realized gains                 0 0 9,571
Other Investments [Member]                      
Gain (Loss) on Investments [Line Items]                      
Other investments: gain on sale of real estate                 4,194 2,454 2,144
Other investments: loss on sale of real estate                 (575) (231) (1,317)
Other investments: impairment losses on real estate                 (1,297) (2,441) (1,195)
Gain (loss) on other investments                 2,322 (218) (368)
Mortgage Loans on Real Estate [Member]                      
Gain (Loss) on Investments [Line Items]                      
Mortgage loans on real estate: decrease (increase) in allowance for credit losses                 1,018 (6,052) (5,621)
Mortgage loans on real estate: recovery of specific allowance                 5,428 0 4,070
Mortgage loans on real estate: change in allowance for provision and recoveries                 $ 6,446 $ (6,052) $ (1,551)