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Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ 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
Premiums and product charges $ 47,781 $ 46,310 $ 42,446 $ 35,679 $ 42,639 $ 38,001 $ 38,370 $ 32,603      
Net investment income 438,262 436,085 418,176 399,669 403,849 386,931 370,882 370,005 $ 1,692,192 $ 1,531,667 $ 1,383,927
Change in fair value of derivatives 69,338 (351,360) (23,024) (31,100) 146,231 39,218 270,883 48,493 (336,146) 504,825 1,076,015
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
Net OTTI losses recognized in operations (13,347) (5,229) (828) (132) (564) (564) (594) (905) (19,536) (2,627) (6,234)
Loss on extinguishment of debt         (1,951) 0 (6,574) (3,977) 0 (12,502) (32,515)
Total revenues 541,883 126,965 441,094 408,995 592,335 460,396 670,737 445,505 1,518,937 2,168,973 2,610,692
Net income $ 33,776 $ 97,306 $ 82,845 $ 5,903 $ 31,217 $ 67,815 $ 36,744 $ (9,753) $ 219,830 $ 126,023 $ 253,283
Earnings (loss) per common share $ 0.41 $ 1.22 $ 1.07 $ 0.08 $ 0.41 $ 0.90 $ 0.49 $ (0.13) $ 2.78 $ 1.69 $ 3.86
Earnings (loss) per common share—assuming dilution $ 0.40 $ 1.19 $ 1.05 $ 0.07 $ 0.39 $ 0.85 $ 0.46 $ (0.13) $ 2.72 $ 1.58 $ 3.38