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SEGMENT INFORMATION - Schedule of Reconciliation of Assets from Segment to Consolidated (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Total consolidated assets $ 5,902,811 $ 5,804,254
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]    
Segment Reporting Information [Line Items]    
Total consolidated assets 3,284,831 3,193,819
Segment Reconciling Items [Member]    
Segment Reporting Information [Line Items]    
Total consolidated assets 2,494,329 2,428,074
Eliminations and Unallocated in Consolidation [Member]    
Segment Reporting Information [Line Items]    
Total consolidated assets $ 123,651 $ 182,361