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BASIS OF PRESENTATION Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Additional paid-in-capital   $ 8,260,537 $ 7,410,537
Goodwill   $ 825,511 825,511
Deferred Policy Acquisition Costs Tax Reimbursements      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Adjustments for amounts misclassified in prior periods $ 8,960    
Restatement Adjustment | Adjustment Pertaining To Tax Deductibility Following Dai-ichi Acquisition      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Additional paid-in-capital     32,000
Goodwill     $ 32,000