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Stock Option Plans and Share-Based Compensation Performance based stock units (PSU) (Details) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Performance Shares [Member]
Mar. 31, 2013
Performance Shares [Member]
Dec. 31, 2013
Performance Shares [Member]
Dec. 31, 2012
Performance Shares [Member]
Mar. 20, 2014
2013 PSU [Member]
Performance Shares [Member]
Mar. 31, 2014
2013 PSU [Member]
Performance Shares [Member]
Jan. 22, 2013
2012 PSU [Member]
Performance Shares [Member]
Dec. 31, 2012
2012 PSU [Member]
Performance Shares [Member]
Mar. 31, 2014
Minimum [Member]
Below the 75th percentile ranking [Member]
PSU program year one [Member]
Performance Shares [Member]
Mar. 31, 2014
Maximum [Member]
Below the 75th percentile ranking [Member]
PSU program year one [Member]
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
PSU percentage eligible for time-based vesting                     110.00% 119.00%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options     $ 2,800,000                  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 6 months 6 days                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number     323,000   225,000              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 14.41   $ 13.32              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     132,000         132,500   125,000    
PSU shares eligible for vesting based on actual shareholder return             137,500   62,500      
Share-based Compensation Arrangement by Share-based Payment Award, First Year Share Vesting Rate             25.00%   25.00%      
Share-based Compensation Arrangement By Share-based Payment Award, Number Of Shares Eligible For Vesting           62,500            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (34,000)                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 16.59                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     $ 14.81                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     0                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 0.00                  
Allocated Share-based Compensation Expense $ 2,729,000 $ 2,926,000 $ 500,000 $ 400,000                
PSU percentage eligible for vesting based on actual return             100.00%   50.00%