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LONG-TERM EQUITY-BASED COMPENSATION PROGRAM (Details) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 15, 2012
May 02, 2011
Mar. 02, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Options/SARs [Member]
Mar. 31, 2013
2006 Omnibus Plan [Member]
Mar. 31, 2013
2009 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2010
2009 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2009
2009 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2009
2009 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Non-management Directors [Member]
Director
Mar. 31, 2013
2010 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2011
2010 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2010
2010 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2010
2010 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Non-management Directors [Member]
Director
Mar. 31, 2013
2011 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2011
2011 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2011
2011 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Non-management Directors [Member]
Director
Mar. 31, 2013
2012 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Dec. 31, 2012
2012 Long-Term Equity-Based Compensation Program [Member]
Options/SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Class A common stock reserved for issuance (in shares)             1,600,000                          
Share based compensation award maximum number of shares per employee (in shares)             80,000                          
Maximum aggregate paying amount of cash and other property other than shares per employee             $ 2,000,000                          
Proportion of options/SARs become exercisable on first anniversary of the approval date (in hundredths)             33.00%             33.00%     33.00%     33.00%
Proportion of options/SARs become exercisable on second anniversary of the approval date (in hundredths)             33.00%             33.00%     33.00%     33.00%
Proportion of options/SARs become exercisable on third anniversary of the approval date (in hundredths)             33.00%             33.00%     33.00%     33.00%
Vested award options annually incremental exercise price expire period from approval date             5 years                          
Aggregate maximum number of options/SARs granted to all participants (in shares)               64,000   190,000 8,000 80,000   192,500 10,000 70,000 170,500 10,000 198,000  
Exercise price of options/SARs granted to all participants (in dollars per share)       $ 0 $ 17.01     $ 8.27   $ 7.68   $ 16.57   $ 15.86   $ 17.49 $ 18.69   $ 17.01  
Proportion of options/SARs grants become exercisable (in hundredths)                 20.00%         18.20%     20.00%   20.00%  
Proportion of remaining options/SARs become exercisable (in hundredths)                 75.00%       36.40%              
Number of non-management directors                     8       8     7    
Options / SARs                                        
Outstanding at beginning of period (in shares)       636,166 564,666                              
Granted (in shares)       0 198,000                              
Exercised (in shares)       0 0                              
Expired or cancelled (in shares)       (118,800) 0                              
Forfeited (in shares)       0 0                              
Outstanding at end of period (in shares)       517,366 762,666                              
Options exercisable at end of period (in shares)       387,255 298,017                              
Weighted average fair value of options (in dollars per share) $ 7.08 $ 8.87 $ 9.69 $ 7.67 $ 7.60                              
Aggregate intrinsic value of options       0 900,000                              
Weighted average contractual term       2 years 3 years 6 months                              
Excess price over the exercise price per share of Class A Common stock for a lump sum cash payment (in dollars per share)           $ 12                            
Weighted Average Exercise Price                                        
Outstanding at beginning of period (in dollars per share)       $ 15.31 $ 14.91                              
Granted (in dollars per share)       $ 0 $ 17.01     $ 8.27   $ 7.68   $ 16.57   $ 15.86   $ 17.49 $ 18.69   $ 17.01  
Exercised (in dollars per share)       $ 0 $ 0                              
Expired or cancelled (in dollars per share)       $ 17.01 $ 0                              
Forfeited (in dollars per share)       $ 0 $ 0                              
Outstanding at end of period (in dollars per share)       $ 14.92 $ 15.46                              
Options exercisable at end of period (in dollars per share)       $ 14.01 $ 13.00                              
Shares [Abstract]                                        
Nonvested at beginning of period (in shares)       313,146                                
Granted (in shares)       0                                
Vested (in shares)       (64,235)                                
Expired or cancelled (in shares)       (118,800)                                
Forfeited (in shares)       0                                
Nonvested at end of period (in shares)       130,111                                
Weighted Average Grant Date Fair Value [Abstract]                                        
Nonvested at beginning of period (in dollars per share)       $ 8.24                                
Granted (in dollars per share)       $ 0                                
Vested (in dollars per share)       $ 9.08                                
Expired or cancelled (in dollars per share)       $ 8.08                                
Forfeited (in dollars per share)       $ 0                                
Nonvested at end of period (in dollars per share)       $ 8.87                                
Fair value of options/SARs estimated at date of grant using weighted average assumptions [Abstract]                                        
Expected life from grant date 5 years 5 years 5 years                                  
Risk-free interest rate (in hundredths) 1.11% 1.88% 2.21%                                  
Volatility (in hundredths) 55.52% 57.68% 58.63%                                  
Dividend yield (in hundredths) 2.40% 0.00% 0.00%                                  
Weighted average fair value (in dollars per share) $ 7.08 $ 8.87 $ 9.69 $ 7.67 $ 7.60                              
Compensation expense related to options/SARs       238,105 351,678                              
Unrecognized compensation cost related to options/SARs       $ 700,000 $ 3,200,000                              
Weighted average period over cost expected to recognized       3 years 3 years                              
Forfeiture rate of options/SARs awarded (in hundredths)       0.00%