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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets    
Fixed maturity securities, available for sale, fair value $ 50,171,303 $ 45,923,727
Derivative instruments 888,208 205,149
Other investments 642,219 355,531
Coinsurance deposits 5,029,374 4,954,068
Liabilities    
Policy benefit reserves 60,203,010 57,606,009
Carrying Amount    
Assets    
Fixed maturity securities, available for sale, fair value 50,171,303 45,923,727
Mortgage loans on real estate 3,083,675 2,943,091
Derivative instruments 888,208 205,149
Other investments 642,219 355,531
Cash and cash equivalents 1,215,967 344,396
Coinsurance deposits 5,029,374 4,954,068
Counterparty collateral 0 33,101
Liabilities    
Policy benefit reserves 59,849,400 57,249,510
Single premium immediate annuity (SPIA) benefit reserves 263,430 270,406
Notes payable 494,850 494,591
Subordinated debentures 243,200 242,982
Amounts due under repurchase agreements 0 109,298
Carrying Amount | Interest Rate Caps    
Assets    
Interest rate derivative assets 59 597
Carrying Amount | Interest Rate Swap    
Assets    
Interest rate derivative assets 0 354
Liabilities    
Interest rate derivative liabilities 881 0
Fair Value    
Assets    
Fixed maturity securities, available for sale, fair value 50,171,303 45,923,727
Mortgage loans on real estate 3,128,732 2,920,612
Derivative instruments 888,208 205,149
Other investments 642,219 348,970
Cash and cash equivalents 1,215,967 344,396
Coinsurance deposits 4,574,116 4,553,790
Counterparty collateral 0 33,101
Liabilities    
Policy benefit reserves 50,673,721 49,180,143
Single premium immediate annuity (SPIA) benefit reserves 271,842 279,077
Notes payable 510,640 489,985
Subordinated debentures 246,046 215,514
Amounts due under repurchase agreements 0 109,298
Fair Value | Interest Rate Caps    
Assets    
Interest rate derivative assets 59 597
Fair Value | Interest Rate Swap    
Assets    
Interest rate derivative assets 0 354
Liabilities    
Interest rate derivative liabilities $ 881 $ 0