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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Unrecognized Compensation Expense) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense, Total/weighted-average $ 23,724
Expected Weighted-average Recognition (Years) 1 year 7 months 6 days
SOSARs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense, SOSARs $ 3,376 [1]
Expected Weighted-average Recognition (Years) 1 year 4 months 24 days [1]
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense, shares $ 14,250
Expected Weighted-average Recognition (Years) 1 year 7 months 6 days
Restricted Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense, shares $ 6,098
Expected Weighted-average Recognition (Years) 1 year 8 months 12 days
[1] Stock-Only Stock Appreciation Rights (SOSARs)