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Fair Values of Financial Instruments (Assets and Liabilities Measured on a Recurring Basis by Fair Value Hierarchy) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Assets    
Derivative assets $ 387,469 $ 337,256
Cash and cash equivalents 707,177 397,749
Counterparty collateral 85,477 82,312
Assets 39,598,676 37,248,394
Liabilities    
Fixed index annuities - embedded derivatives 6,254,466 5,983,622
Liabilities 6,259,841 5,986,761
Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 740 1,410
Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 5,375 3,139
Equity Securities [Member]    
Assets    
Available for sale securities 7,813 7,828
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 473,402 471,256
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,566,287 1,398,611
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 3,883,737 3,755,367
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 221,861 212,565
Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 25,168,468 23,802,394
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,432,353 1,462,072
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 4,503,261 4,174,396
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,160,631 1,145,178
Quoted Prices in Active Markets (Level 1) [Member]    
Assets    
Derivative assets 0 0
Cash and cash equivalents 707,177 397,749
Counterparty collateral 0 0
Assets 1,148,811 836,468
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 441,625 438,598
Quoted Prices in Active Markets (Level 1) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 9 121
Quoted Prices in Active Markets (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Assets    
Derivative assets 387,469 337,256
Cash and cash equivalents 0 0
Counterparty collateral 85,477 82,312
Assets 38,449,865 36,411,926
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 5,375 3,139
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 740 1,410
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 5,375 3,139
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 7,813 7,828
Significant Other Observable Inputs (Level 2) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 31,777 32,658
Significant Other Observable Inputs (Level 2) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,566,287 1,398,611
Significant Other Observable Inputs (Level 2) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 3,883,737 3,755,367
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 221,861 212,565
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 25,168,459 23,802,273
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,432,353 1,462,072
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 4,503,261 4,174,396
Significant Other Observable Inputs (Level 2) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,160,631 1,145,178
Significant Unobservable Inputs (Level 3) [Member]    
Assets    
Derivative assets 0 0
Cash and cash equivalents 0 0
Counterparty collateral 0 0
Assets 0 0
Liabilities    
Fixed index annuities - embedded derivatives 6,254,466 5,983,622
Liabilities 6,254,466 5,983,622
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 0 0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities $ 0 $ 0