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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]      
Deferred policy acquisition costs $ 2,923,454 $ 3,535,838 $ 2,714,523
Future policy benefits, losses, claims and loss expenses 61,893,945 57,606,009 56,142,673
Unearned premiums 0 0 0
Other policy claims and benefits payable 256,105 270,858 282,884
Premium revenue 263,569 250,968 234,722
Net investment income 2,307,635 2,147,812 1,991,997
Benefits, claims, losses and settlement expenses 2,865,621 483,075 3,163,234
Amortization of deferred policy acquisition costs 87,717 327,991 255,964
Other operating expenses $ 195,442 $ 170,290 $ 156,183