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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Annuity Deposits (Net of Coinsurance), By Product Type
Annuity deposits (net of coinsurance) collected in 2017, 2016 and 2015, by product type were as follows:
 
 
Year Ended December 31,
Product Type
 
2017
 
2016
 
2015
 
 
(Dollars in thousands)
Fixed index annuities
 
$
3,668,121

 
$
5,035,818

 
$
6,491,981

Annual reset fixed rate annuities
 
74,572

 
63,582

 
44,715

Multi-year fixed rate annuities
 
22,291

 
256,894

 
42,709

Single premium immediate annuities (SPIA)
 
24,946

 
35,851

 
32,752

 
 
$
3,789,930

 
$
5,392,145

 
$
6,612,157