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Stock Option Plans and Share-Based Compensation PSU performance to vesting table by Program year (Details) (USD $)
6 Months Ended 12 Months Ended 6 Months Ended 3 Months Ended 0 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Performance Shares [Member]
Dec. 31, 2011
Performance Shares [Member]
Dec. 31, 2012
Performance Shares [Member]
Jun. 30, 2013
Employee Stock [Member]
Jun. 30, 2013
PSU program year one [Member]
Performance Shares [Member]
Jun. 30, 2013
Below the 35th percentile ranking [Member]
PSU Program Year Two [Member]
Performance Shares [Member]
Jun. 30, 2013
Below 50th percentile ranking [Member]
PSU Program Year Two [Member]
Performance Shares [Member]
Jun. 30, 2013
At least 50th percentile (after yr one) [Member]
PSU Program Year Two [Member]
Performance Shares [Member]
Jun. 30, 2013
Minimum [Member]
Below the 75th percentile ranking [Member]
PSU program year one [Member]
Performance Shares [Member]
Jun. 30, 2013
Maximum [Member]
Below the 75th percentile ranking [Member]
PSU program year one [Member]
Performance Shares [Member]
Jun. 15, 2013
2011 PSU [Member]
Performance Shares [Member]
Jan. 17, 2012
2011 PSU [Member]
Performance Shares [Member]
Dec. 31, 2012
2011 PSU [Member]
Performance Shares [Member]
Jun. 30, 2013
2011 PSU [Member]
Below the 35th percentile ranking [Member]
Performance Shares [Member]
Jun. 30, 2013
2011 PSU [Member]
Below 50th percentile ranking [Member]
Performance Shares [Member]
Jun. 30, 2013
2011 PSU [Member]
Below the 65th percentile ranking [Member]
Performance Shares [Member]
Jun. 30, 2013
2011 PSU [Member]
At or above the 75th percentile ranking [Member]
Performance Shares [Member]
Jan. 22, 2013
2012 PSU [Member]
Performance Shares [Member]
Jun. 30, 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       175,000                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 13.07   $ 11.00                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   140,000 100,000                 2,500   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   $ 14.74                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   38,000                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 11.02                                      
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   24,000                                      
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 3,646,005.60       1,291,717                                
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period         256,994