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COMMON STOCK Schedule of Changes in Restricted Stock - TIme Based Awards (Details) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award The fair value of the time-based restricted shares is amortized ratably over the requisite service period, primarily three years. The time-based shares generally vest ratably on each anniversary following the grant date that a participant is continuously employed.    
Time based shares granted to executives 80,707    
Number of Shares      
Outstanding beginning of year, January 1, 564,332    
Granted 313,639    
Vested (333,167)    
Forfeited (19,723)    
Outstanding end of year, December 31, 525,081 564,332  
Weighted-Average Grant-Date Fair Value      
Outstanding at beginning of year, January 1, $ 46.02    
Weighted-average grant date fair value per share 48.88 $ 56.45 $ 45.53
Vested 41.59    
Forfeited 54.29    
Outstanding at end of year, December 31, $ 50.23 $ 46.02  
Total intrinsic value of time based awards vested $ 17,077 $ 18,278 $ 13,640
Total intrinsic value of time-based awards non-vested $ 28,029 $ 23,290 $ 34,688
Market price per common share as of December 31, $ 53.38 $ 41.27 $ 53.22
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 16,400    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 22 days