Annual report pursuant to Section 13 and 15(d)

STOCK BASED AND DEFERRED COMPENSATION - Narrative (Details)

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STOCK BASED AND DEFERRED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended 72 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock authorized under stock compensation plan 4,150,000     4,150,000
Remaining shares available for grant 1,145,923     1,145,923
Stock options granted (in shares) 0 0 0 0
Total intrinsic value of options exercises $ 3,500,000 $ 1,700,000 $ 4,800,000  
Deferred compensation plan expense $ 0 $ 0 $ 0  
Employees [Member] | Non-vested stock awards [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for non-vested stock awards and stock options 3 years      
Employees [Member] | Non-vested stock awards [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for non-vested stock awards and stock options 5 years      
Senior executive officers and non-employee directors [Member] | Non-vested stock and performance-based awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for non-vested stock awards and stock options 3 years