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Benefit Plans (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Non-vested Shares [Member]
Dec. 31, 2012
Non-vested Shares [Member]
Dec. 31, 2011
Non-vested Shares [Member]
Dec. 31, 2010
Employee Stock Option [Member]
Dec. 31, 2013
Employee Stock Option [Member]
Dec. 31, 2012
Employee Stock Option [Member]
Dec. 31, 2011
Employee Stock Option [Member]
Dec. 31, 2010
Options 2010 [Member]
Dec. 31, 2013
Options 2010 [Member]
Dec. 31, 2013
Options 2009 [Member]
Jan. 08, 2010
Options 2009 [Member]
Dec. 31, 2013
Options 2008 [Member]
Dec. 31, 2008
Options 2008 [Member]
Dec. 31, 2009
Options 2008 [Member]
Dec. 31, 2008
Options 2008 [Member]
Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member]
Dec. 31, 2008
Options 2008 [Member]
Minimum [Member]
Dec. 31, 2008
Options 2008 [Member]
Maximum [Member]
Dec. 31, 2013
Shares Subject to Time [Member]
Dec. 31, 2013
Shares Subject to Performance [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 4,288,000                                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       2,521,046 1,465,446 1,179,585                             2,445,906 75,140
Common Share Options Granted (shares) 0 0 0               1,248,501     1,265,500   2,000,000            
Common Share Options Exercise Price (usd per share)             $ 6.23 $ 6.95 $ 6.44 $ 6.36 $ 7.95     $ 6.39   $ 5.6            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate             20.00%             20.00%       50.00%        
Number Of Trading Period Days Where Entity's Average Closing Price Per Common Share Is Greater Than The Stated Lower Amount Triggering Vesting                               20 days            
Stated Lower Amount Where Entity's Average Closing Price Per Common Share Is Greater Than The Stated Amount Triggering                                     $ 8.00 $ 10.00    
Share Based Compensation Arrangement by Share Based Payment Award Options Convertible To Common Shares                                 1.13          
Options Converted To Common Shares Exercise Price                                 $ 4.97          
Deferred Compensation Equity                       2,422,000 2,771,000   2,480,000              
Vesting Period 5 years                                          
Recognized Compensation Expense Average Period                         5 years   3 years 7 months 6 days              
Recognized Compensation Expense 1,037,000 1,197,000 1,384,000                                      
Unrecognized Compensation Costs       22,426,000       1,518,000                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       3,486,552                                    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       4 years 4 months 24 days                                    
Common Stock Held in Trust   427,531                                        
Initial Vesting Percentage 25.00%                                          
Vesting Percentage 100.00%                                          
Defined Contribution Plan, Cost Recognized 298,000 279,000 308,000                                      
Allocated Share-based Compensation Expense 7,145,000 3,030,000 2,062,000                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 8,607,000 $ 1,603,000 $ 2,100,000