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Performance Incentive Plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares Authorized, 2007 Plan       5,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted shares granted 28,913      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Exercise Price [Abstract]        
Weighted Average Share Price, Restriced shares granted $ 35.08      
Shares available under the 2007 Plan for grant, end of period 3,958,300      
Allocated Share-based Compensation Expense $ 7,459 $ 8,131 $ 6,390  
Unrecognized Compensation Cost 10,929      
Weighted Average Period for Recognition of Unrecognized Compensation Cost 2 years 6 months 1 day      
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Non-vested restricted shares outstanding 964,612      
Restricted shares granted 298,896      
Restricted shares vested (446,607)      
Restricted shares forfeited (241)      
Restricted shares repurchased (8,474)      
Non-vested restricted shares outstanding 808,186      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Exercise Price [Abstract]        
Weighted Average Share Price, Non-vested Restricted Shares, Outstanding $ 23.40      
Weighted Average Share Price, Restriced shares granted $ 33.73      
Weighted Average Share Price, Restricted Shares Vested $ 21.41      
Weighted Average Share Price, Restricted Shares Forfeited $ 30.68      
Weighed Average Share Price, Restricted shares repurchased $ 24.36      
Weighted Average Share Price, Non-vested Restricted Shares, Outstanding $ 28.18      
Directors' fees
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted shares granted 16,605      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Exercise Price [Abstract]        
Weighted Average Share Price, Restriced shares granted $ 35.08      
Deferred Director's fees
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted shares granted 12,308      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Exercise Price [Abstract]        
Weighted Average Share Price, Restriced shares granted $ 35.09      
Performance Shares
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted shares granted 152,901 185,915    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Exercise Price [Abstract]        
Performance period used In calculation 3 years      
Weighted average grant price, grants to certain executive officers $ 21.54 $ 15.71    
Allocated Share-based Compensation Expense $ 729 $ 1,684 $ 1,702  
Performance Shares | Executive Officers
       
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Exercise Price [Abstract]        
Weighted average grant price, grants to certain executive officers $ 33.73 $ 26.85    
Minimum | Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Maximum | Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 5 years