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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]      
Deferred policy acquisition costs $ 3,535,838 $ 2,714,523 $ 2,905,377
Future policy benefits, losses, claims and loss expenses 57,606,009 56,142,673 51,637,026
Unearned premiums 0 0 0
Other policy claims and benefits payable 270,858 282,884 298,347
Premium revenue 250,968 234,722 217,346
Net investment income 2,147,812 1,991,997 1,849,872
Benefits, claims, losses and settlement expenses 483,075 3,163,234 1,572,586
Amortization of deferred policy acquisition costs 327,991 255,964 374,012
Other operating expenses $ 170,290 $ 156,183 $ 143,437