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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activities      
Net Income $ 57,798 $ 86,248 $ 42,933
Adjustments to reconcile net income to net cash provided by operating activities:      
Interest Sensitive And Index Product Benefits 818,087 775,757 733,218
Amortization of deferred sales inducements 87,157 71,781 59,873
Annuity product charges (89,006) (76,189) (69,075)
Change in fair value of embedded derivatives 286,899 (105,194) 130,950
Increase in traditional life and accident and health insurance reserves 26,150 76,220 43,921
Policy acquisition costs deferred (403,411) (478,834) (402,607)
Amortization of deferred policy acquisition costs 164,919 143,478 136,388
Depreciation, Depletion and Amortization, Nonproduction 18,404 18,970 11,580
Amortization of discounts and premiums on investments (69,828) (154,483) (240,532)
Loss on extinguishment of debt 0 0 292
Realized gains on investments and net OTTI losses recognized 21,386 52,617 141
Change in fair value of derivatives (221,138) 112,608 (141,719)
Deferred Income Tax Expense (Benefit) (52,336) (80,869) (118,048)
Share-based Compensation 6,552 9,339 11,993
Change in accrued investment income (32,896) (61,292) (53,987)
Change in income taxes recoverable/payable 13,197 (2,307) 97,550
Change in other assets (7,090) 5,005 (26,516)
Change in other policy funds and contract claims 55,158 177,734 103,457
Change in collateral held for derivatives 99,242 (215,775) 35,075
Change in other liabilities 5,927 (77,082) 64,776
Other (857) 59 812
Net Cash Provided by (Used in) Operating Activities 784,314 277,791 420,475
Sales, maturities, or repayments of investments:      
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 3,298,623 3,705,605 4,568,499
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities 2,618,207 219,372 1,585,267
Equity securities - available for sale 13,604 2,958 46,187
Mortgage loans on real estate 543,211 206,741 145,754
Derivative instruments 483,362 506,057 492,058
Short-term investments 0 0 600,000
Other investments 33,601 2,274 0
Acquisition of investments:      
Fixed maturity securities - available for sale (8,266,692) (5,347,839) (8,544,788)
Fixed maturity securities - held for investment 0 (1,940,163) (745,207)
Equity securities - available for sale 0 0 (10,125)
Mortgage loans on real estate (386,507) (481,680) (317,250)
Derivative instruments (379,592) (395,938) (331,263)
Short-term investments 0 0 (599,746)
Other investments (86,569) (77,955) (456)
Purchases of property, furniture and equipment (738) (5,265) (5,318)
Net Cash Provided by (Used in) Investing Activities (2,129,490) (3,605,833) (3,116,388)
Financing activities      
Receipts credited to annuity policyholder account balances 3,782,275 4,784,511 4,497,091
Coinsurance deposits 4,885 (122,415) (267,638)
Return of annuity policyholder account balances (1,575,340) (1,494,554) (1,465,434)
Financing fees incurred and deferred 0 (1,566) (6,800)
Proceeds from Notes Payable 0 0 200,000
Repayments of notes payable 0 (46,251) (156,641)
Purchase of 2015 notes hedges 0 0 (37,000)
Repayment of subordinated debentures (1,141) 0 0
Acquisition of common stock 0 (484) (1,224)
Excess tax benefits realized from share-based compensation plans 481 1,061 480
Proceeds from Issuance of Common Stock 5,741 4,686 6,124
Proceeds from issuance of warrants 0 0 15,600
Change in checks in excess of cash balance 1,071 17,156 (13,238)
Payments of Dividends (9,203) (6,916) (5,643)
Net cash provided by financing activities 2,208,769 3,135,228 2,765,677
Cash and Cash Equivalents, Period Increase (Decrease) 863,593 (192,814) 69,764
Cash and cash equivalents at beginning of period 404,952 597,766 528,002
Cash and cash equivalents at end of period 1,268,545 404,952 597,766
Cash paid during period for:      
Interest expense 27,666 30,650 25,802
Income taxes 67,450 129,250 143,748
Income tax refunds received 512 466 101,395
Non-cash operating activity:      
Deferral of sales inducements 306,659 385,123 370,714
Non-cash investing activity:      
Real estate acquired in satisfaction of mortgage loans 26,324 20,978 7,408
Mortgage loan on real estate sold 0 1,215 0
Non-cash financing activities:      
Conversion of subordinated debentures $ 20,770 $ 0 $ 60