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Consolidated Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities    
Net Income $ 26,031,000 $ 10,471,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Interest Sensitive And Index Product Benefits 225,809,000 139,123,000
Amortization of deferred sales inducements 28,831,000 16,710,000
Annuity product charges (21,481,000) (19,393,000)
Change in fair value of embedded derivatives 363,272,000 359,066,000
Increase in traditional life and accident and health insurance reserves 402,000 6,032,000
Policy acquisition costs deferred (94,638,000) (91,177,000)
Amortization of deferred policy acquisition costs 46,230,000 34,284,000
Depreciation, Depletion and Amortization, Nonproduction 4,607,000 4,547,000
Amortization of discounts and premiums on investments (6,296,000) (39,738,000)
Realized gains on investments and net OTTI losses recognized (7,348,000) 8,957,000
Change in fair value of derivatives (373,962,000) (259,161,000)
Deferred Income Tax Expense (Benefit) (2,451,000) (12,443,000)
Share-based Compensation 1,290,000 1,106,000
Change in accrued investment income (36,508,000) (7,685,000)
Change in income taxes recoverable/payable 5,438,000 17,441,000
Change in other assets 1,315,000 (682,000)
Change in other policy funds and contract claims (8,451,000) 18,224,000
Change in collateral held for derivatives 224,755,000 292,043,000
Change in other liabilities (6,215,000) (19,523,000)
Other (1,014,000) (482,000)
Net Cash Provided by (Used in) Operating Activities 369,616,000 457,720,000
Sales, maturities, or repayments of investments:    
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 937,343,000 965,283,000
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities 0 1,140,816,000
Equity securities - available for sale 0 2,605,000
Mortgage loans on real estate 125,998,000 99,199,000
Derivative instruments 146,918,000 57,015,000
Other investments 5,371,000 4,568,000
Acquisition of investments:    
Fixed maturity securities - available for sale (2,308,052,000) (988,547,000)
Mortgage loans on real estate (95,147,000) (43,678,000)
Derivative instruments (82,448,000) (83,201,000)
Other investments (199,000) (17,000)
Purchases of property, furniture and equipment (78,000) (191,000)
Net Cash Provided by (Used in) Investing Activities (1,270,294,000) 1,153,852,000
Financing activities    
Receipts credited to annuity policyholder account balances 914,936,000 933,632,000
Coinsurance deposits 5,641,000 (49,478,000)
Return of annuity policyholder account balances (402,185,000) (368,708,000)
Repayments of notes payable (2,500,000)  
Excess tax benefits realized from share-based compensation plans 305,000 665,000
Proceeds from Issuance of Common Stock 7,103,000 721,000
Change in checks in excess of cash balance (11,570,000) (6,243,000)
Net cash provided by financing activities 514,230,000 510,589,000
Cash and Cash Equivalents, Period Increase (Decrease) (386,448,000) 2,122,161,000
Cash and cash equivalents at beginning of period 1,268,545,000 404,952,000
Cash and cash equivalents at end of period 882,097,000 2,527,113,000
Cash paid during period for:    
Interest expense 6,470,000 7,014,000
Income taxes 10,200,000 0
Non-cash operating activity:    
Deferral of sales inducements 73,898,000 70,019,000
Non-cash investing activity:    
Real estate acquired in satisfaction of mortgage loans 844,000 3,303,000
Non-cash financing activities:    
Conversion of subordinated debentures $ 0 $ 60,000