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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
Jun. 30, 2016
Dec. 31, 2015
Assets    
Derivative assets $ 576,262 $ 337,256
Cash and cash equivalents 1,547,041 397,749
Counterparty collateral 91,457 82,312
Assets 42,086,803 37,248,394
Liabilities    
Fixed index annuities - embedded derivatives 6,499,015 5,983,622
Liabilities 6,504,986 5,986,761
Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 427 1,410
Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 5,971 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 449,439 471,256
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,380,266 1,398,611
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 3,975,544 3,755,367
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 253,990 212,565
Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 26,383,116 23,802,394
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,392,441 1,462,072
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 4,735,210 4,174,396
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,293,797 1,145,178
Quoted Prices in Active Markets (Level 1) [Member]    
Assets    
Derivative assets 0 0
Cash and cash equivalents 1,547,041 397,749
Counterparty collateral 0 0
Assets 1,989,274 836,468
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 442,226 438,598
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 7 121
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 576,262 337,256
Cash and cash equivalents 0 0
Counterparty collateral 91,457 82,312
Assets 40,097,529 36,411,926
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 5,971 3,139
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 427 1,410
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 5,971 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 7,213 32,658
Significant Other Observable Inputs (Level 2) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,380,266 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 3,975,544 3,755,367
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 253,990 212,565
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 26,383,109 23,802,273
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,392,441 1,462,072
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 4,735,210 4,174,396
Significant Other Observable Inputs (Level 2) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,293,797 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 6,499,015 5,983,622
Liabilities 6,499,015 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