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STOCK-BASED COMPENSATION - Board of Directors Compensation - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 32,300,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 5 months 9 days    
Director [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Restricted stock awards and units vesting terms 1 year    
Fair value of shares issued $ 1,500,000 $ 865,000 $ 797,000
Shares issued (in shares) 30,000 29,167 23,750