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Significant Accounting Policies (Premiums and Annuity Deposits, By Product Type) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Product Information [Line Items]      
Fixed index annuities $ 5,035,818 $ 6,491,981 $ 3,911,109
Annual reset fixed rate annuities 63,582 44,715 56,647
Multi-year fixed rate annuities 256,894 42,709 21,125
Single premium immediate annuities (SPIA) 35,851 32,752 24,580
Life insurance 9,946 10,917 10,810
Premiums and annuity deposits, net of coinsurance $ 5,402,091 $ 6,623,074 $ 4,024,271