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Stock Option Plans and Share-Based Compensation PSU performance to vesting table by Program year (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Performance Shares [Member]
Dec. 31, 2011
Performance Shares [Member]
Dec. 31, 2012
Performance Shares [Member]
Mar. 31, 2013
Employee Stock [Member]
Mar. 31, 2013
PSU program year one [Member]
Performance Shares [Member]
Mar. 31, 2013
Below the 35th percentile ranking [Member]
PSU Program Year Two [Member]
Performance Shares [Member]
Mar. 31, 2013
Below 50th percentile ranking [Member]
PSU Program Year Two [Member]
Performance Shares [Member]
Mar. 31, 2013
At least 50th percentile (after yr one) [Member]
PSU Program Year Two [Member]
Performance Shares [Member]
Mar. 31, 2013
Minimum [Member]
Below the 75th percentile ranking [Member]
PSU program year one [Member]
Performance Shares [Member]
Mar. 31, 2013
Maximum [Member]
Below the 75th percentile ranking [Member]
PSU program year one [Member]
Performance Shares [Member]
Jan. 17, 2012
2011 PSU [Member]
Performance Shares [Member]
Dec. 31, 2012
2011 PSU [Member]
Performance Shares [Member]
Mar. 31, 2013
2011 PSU [Member]
Below the 35th percentile ranking [Member]
Performance Shares [Member]
Mar. 31, 2013
2011 PSU [Member]
Below 50th percentile ranking [Member]
Performance Shares [Member]
Mar. 31, 2013
2011 PSU [Member]
Below the 65th percentile ranking [Member]
Performance Shares [Member]
Mar. 31, 2013
2011 PSU [Member]
At or above the 75th percentile ranking [Member]
Performance Shares [Member]
Jan. 22, 2013
2012 PSU [Member]
Performance Shares [Member]
Mar. 31, 2013
2012 PSU [Member]
Performance Shares [Member]
Dec. 31, 2012
2012 PSU [Member]
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Shares, Issued         4,039,838                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   281,000   175,000                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 14.48   $ 11.00                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   138,000 100,000                   10,000             125,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 17.40                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   16,000                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 15.66                                    
Percentile ranking of 2011 shareholder return           76.30%                       35.30%    
PSU percentage eligible for time-based vesting             0.00% 50.00% 100.00% 110.00% 119.00%     0.00% 50.00% 100.00% 120.00%      
PSU percentage eligible for vesting based on actual return                       120.00%           50.00%    
PSU shares eligible for vesting based on actual shareholder return           120,000           120,000           62,500    
Share-based Compensation Arrangement by Share-based Payment Award, First Year Share Vesting Rate                                     25.00%  
Share-based Compensation Arrangement by Share-based payment Award, Percent Vested in First Year           0.00%                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   16,000                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   $ 0.00                                    
Common Stock, Capital Shares Reserved for Future Issuance 1,107,858       1,291,717                              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period         256,994