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Shareholders' Equity Transactions Narrative (Details) (USD $)
0 Months Ended 3 Months Ended
May 21, 2013
May 16, 2013
Mar. 27, 2013
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   4,460,337      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures       0  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date May 21, 2013        
Annual Shareholder Meeting Date   May 16, 2013      
Share-based Compensation Arrangement by Share-based Payment Award, Adoption date     Mar. 27, 2013    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized       $ 17,457,000  
Allocated Share-based Compensation Expense       699,000 1,160,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years  
Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award Net Restricted Stock Award Activity       376,068  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       598,137  
Allocated Share Based Compensation Expense Recognized Weighted Average Period       1 year 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       188,034  
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited       7,575  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Entirety Date       May 15, 2017  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 20.05  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized       7,230,000  
Allocated Share-based Compensation Expense       115,000  
Stock Options [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       3,625,869 [1]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options       7,217,000  
Employee Service Share-based Compensation, Term       10 years  
Allocated Share-based Compensation Expense       530,000  
Performance Shares [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award Net Restricted Stock Award Activity       458,400  
Allocated Share Based Compensation Expense Recognized Weighted Average Period       1 year 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       152,800  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 20.05  
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period       3 years  
Period of Performance Award Measurement, Beginning       Jan. 01, 2016  
Period of Performance Award Measurement, Ending       Dec. 31, 2016  
Level of Performance Award Achievement, Minimum       0.00%  
Level of Performance Award Achievement, Maximum       150.00%  
Level of Performance Award Achievement, Target       100.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested       3,010,000  
Allocated Share-based Compensation Expense       $ 54,000  
[1] *Shares available for grant as of March 31, 2014 reduced by net restricted stock and restricted stock unit award and performance share and performance share unit award activity of 376,068 shares and 458,400