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Deferred Policy Acquisition Costs (Tables)
 12 Months Ended
Dec. 31, 2017
Deferred Policy Acquisition Costs Disclosures [Abstract]  
Deferred Policy Acquisition Costs [Table Text Block]
The following reflects the amounts of policy acquisition costs deferred and amortized (dollars in thousands):
 
Years ended December 31,
 
2017
 
2016
 
2015
Balance, beginning of year
 
$
3,338,605

 
$
3,392,437

 
$
3,342,575

Capitalization
 
348,470

 
350,233

 
352,260

Amortization (including interest)
 
(432,474
)
 
(341,115
)
 
(288,630
)
Change in value of embedded derivatives
 
(70,392
)
 
(40,077
)
 
58,754

Attributed to unrealized investment gains (losses)
 
(8,220
)
 
(3,541
)
 
17,510

Foreign currency translation
 
63,835

 
(19,332
)
 
(90,032
)
Balance, end of year
 
$
3,239,824

 
$
3,338,605

 
$
3,392,437