SIGNIFICANT TRANSACTIONS - USWC Holding Company Acquisition (Details) - Life Business - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	May 01, 2018
Assets
Fixed maturities			$ 12,588,512
Mortgage loans			435,405
Policy loans			131,489
Total investments			13,155,406
Cash			38,456
Accrued investment income			152,030
Reinsurance receivables			272
Value of business acquired			336,862
Other assets			916
Total assets			13,683,942
Liabilities
Future policy benefits and claims			11,747,501
Unearned premiums			0
Total policy liabilities and accruals			11,747,501
Annuity account balances			1,823,444
Other policyholders’ funds			41,936
Other liabilities			71,061
Total liabilities			13,683,942
Net assets acquired			$ 0
Business Acquisition, Pro Forma Information [Abstract]
Revenue	$ 5,082,755	$ 5,548,132
Net Income	$ 240,071	$ 1,309,876