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COMMON STOCK Schedule of Changes in Restricted Stock - TIme Based Awards (Details) (Restricted Stock [Member], USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock [Member]
       
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 or four years. The time-based shares vest ratably on each annual anniversary following the grant date that a participant is continuously employed.    
Time based shares granted to executives   103,050    
Number of Shares        
Outstanding beginning of year, January 1, 646,490 646,490    
Granted   311,051    
Vested   (282,787)    
Forfeited   (22,973)    
Outstanding end of year, December 31,   651,781 646,490  
Weighted-Average Grant-Date Fair Value        
Outstanding at beginning of year, January 1, $ 27.93 $ 27.93    
Weighted-average grant date fair value per share   $ 45.53 $ 26.59 $ 33.71
Vested   $ 27.57    
Forfeited   $ 31.52    
Outstanding at end of year, December 31,   $ 36.36 $ 27.93  
Total intrinsic value of time based awards vested   $ 13,640,000 $ 5,950,000 $ 9,030,000
Total intrinsic value of time-based awards non-vested   34,688,000 21,470,000 18,531,000
Market price per common share as of December 31,   $ 53.22 $ 33.21 $ 35.11
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 15,700,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 0 months 0 days