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Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) (USD $)
In Thousands, except Per Share data, 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
Premiums and product charges $ 42,986 $ 36,325 $ 35,062 $ 34,565 $ 39,720 $ 47,413 $ 40,817 $ 37,731      
Net investment income 363,947 354,147 336,143 329,690 321,160 318,594 320,259 326,910 1,383,927 1,286,923 1,218,780
Change in fair value of derivatives 444,985 193,028 64,040 373,962 (48,266) 161,090 (150,847) 259,161 1,076,015 221,138 (114,728)
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)
Net OTTI losses recognized in operations 0 (222) (2,775) (3,237) (9,387) (1,686) (978) (2,881) (6,234) (14,932) (33,976)
Loss on extinguishment of debt (30,988) (938) (589) 0         (32,515) 0 0
Total revenues 837,294 580,263 447,570 745,565 304,698 524,173 208,640 614,845 2,610,692 1,652,356 1,246,536
Net income (loss) 50,958 56,181 120,113 26,031 36,397 (7,829) 18,759 10,471 253,283 57,798 86,248
Earnings (loss) per common share $ 0.73 $ 0.86 $ 1.87 $ 0.41 $ 0.58 $ (0.13) $ 0.31 $ 0.18 $ 3.86 $ 0.94 $ 1.45
Earnings (loss) per common share—assuming dilution $ 0.65 $ 0.75 $ 1.71 $ 0.38 $ 0.55 $ (0.13) $ 0.30 $ 0.16 $ 3.38 $ 0.89 $ 1.37
Restatement Adjustment [Member]
                      
Premiums and product charges   $ 7,400 $ 8,600 $ 10,400 $ 12,800 $ 20,200 $ 15,700 $ 15,100