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Stock Option Plans and Share-Based Compensation Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Performance Shares [Member]
Dec. 31, 2011
Performance Shares [Member]
Jun. 30, 2013
Employee Stock Option [Member]
May 21, 2013
2009 Equity Incentive Plan [Member]
Dec. 31, 2010
2009 Equity Incentive Plan [Member]
Jun. 30, 2013
2009 Equity Incentive Plan [Member]
May 19, 2009
2009 Equity Incentive Plan [Member]
Dec. 31, 2012
2009 Equity Incentive Plan [Member]
Stock Options [Member]
VestingInstallment
Jun. 15, 2013
2011 PSU [Member]
Performance Shares [Member]
Dec. 31, 2012
2011 PSU [Member]
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
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
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               2,100,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Not Available for Grant For Each Share Granted           0 1.40        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized         2,500,000 2,600,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Monthly Vesting Installments After Initial Cliff                 36    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                 10 years    
Common Stock, Capital Shares Reserved for Future Issuance 3,646,006                    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options       $ 6.4              
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   1 year 7 months 6 days   2 years 7 months 24 days