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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets    
Fixed maturity securities, available for sale, fair value $ 48,037,107 $ 45,923,727
Derivative instruments 755,866 205,149
Other investments 361,804 355,531
Coinsurance deposits 4,995,744 4,954,068
Liabilities    
Policy benefit reserves 58,995,947 57,606,009
Carrying Amount    
Assets    
Fixed maturity securities, available for sale, fair value 48,037,107 45,923,727
Mortgage loans on real estate 3,049,998 2,943,091
Derivative instruments 755,866 205,149
Other investments 361,804 355,531
Cash and cash equivalents 1,115,890 344,396
Coinsurance deposits 4,995,744 4,954,068
Counterparty collateral 114,137 33,101
Liabilities    
Policy benefit reserves 58,639,873 57,249,510
Single premium immediate annuity (SPIA) benefit reserves 266,102 270,406
Notes payable 494,720 494,591
Subordinated debentures 243,090 242,982
Amounts due under repurchase agreements 243,331 109,298
Carrying Amount | Interest Rate Caps    
Assets    
Interest rate derivative assets 268 597
Carrying Amount | Interest Rate Swap    
Assets    
Interest rate derivative assets 0 354
Liabilities    
Interest rate derivative liabilities 95 0
Fair Value    
Assets    
Fixed maturity securities, available for sale, fair value 48,037,107 45,923,727
Mortgage loans on real estate 3,054,546 2,920,612
Derivative instruments 755,866 205,149
Other investments 352,390 348,970
Cash and cash equivalents 1,115,890 344,396
Coinsurance deposits 4,549,793 4,553,790
Counterparty collateral 114,137 33,101
Liabilities    
Policy benefit reserves 49,765,848 49,180,143
Single premium immediate annuity (SPIA) benefit reserves 274,693 279,077
Notes payable 501,000 489,985
Subordinated debentures 235,003 215,514
Amounts due under repurchase agreements 243,331 109,298
Fair Value | Interest Rate Caps    
Assets    
Interest rate derivative assets 268 597
Fair Value | Interest Rate Swap    
Assets    
Interest rate derivative assets 0 354
Liabilities    
Interest rate derivative liabilities $ 95 $ 0