REINSURANCE - Receivables (Details) - Successor - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Reinsurance
Reinsurance receivables	$ 5,323,846	$ 5,536,751
Reinsurer Concentration Risk | Security Life of Denver Insurance Company | A
Reinsurance
Reinsurance receivables	762,200	800,600
Reinsurer Concentration Risk | Swiss Re Life & Health America, Inc. | A plus
Reinsurance
Reinsurance receivables	682,600	719,200
Reinsurer Concentration Risk | Lincoln National Life Insurance Co. | A plus
Reinsurance
Reinsurance receivables	530,900	546,000
Reinsurer Concentration Risk | Transamerica Life Insurance Co. | A plus
Reinsurance
Reinsurance receivables	367,800	396,600
Reinsurer Concentration Risk | SCOR Global Life | A
Reinsurance
Reinsurance receivables	354,800	320,400
Reinsurer Concentration Risk | American United Life Insurance Company | A plus
Reinsurance
Reinsurance receivables	285,600	314,200
Reinsurer Concentration Risk | RGA Reinsurance Company | A plus
Reinsurance
Reinsurance receivables	269,000	303,500
Reinsurer Concentration Risk | Centre Reinsurance (Bermuda) Ltd
Reinsurance
Reinsurance receivables	243,600	247,600
Reinsurer Concentration Risk | Scottish Re (U.S.) Inc.
Reinsurance
Reinsurance receivables	232,800	268,600
Reinsurer Concentration Risk | The Canada Life Assurance Company | A plus
Reinsurance
Reinsurance receivables	$ 216,200	$ 207,500