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Performance Incentive Plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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, Options, Outstanding [Roll Forward]        
Outstanding, January 1 5,000 7,500 12,154  
Options granted 0 0 0  
Options exercised (5,000) (2,500) (4,654)  
Options surrendered 0 0 0  
Outstanding, December 31 0 5,000 7,500  
Options exercisable 0 5,000 7,500  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Outstanding, January 1 $ 14.57 $ 14.11 $ 13.72  
Weighted average exercise price, options granted $ 0.00 $ 0.00 $ 0.00  
Weighted average exercise price, options exercised $ 14.57 $ 13.20 $ 13.08  
Outstanding, December 31 $ 0.00 $ 14.57 $ 14.11  
Weighted average exercise Price, options exercisable $ 0.00 $ 14.57 $ 14.11  
Proceeds from stock options exercised $ 73 $ 33 $ 61  
Intrinsic value of options exercised 61 24 43  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted shares granted 34,700      
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 $ 28.79      
Shares available under the 2007 Plan for grant, end of period 4,281,900      
Allocated Share-based Compensation Expense 8,131 6,390 5,310  
Unrecognized Compensation Cost 9,433      
Weighted Average Period for Recognition of Unrecognized Compensation Cost 2 years 7 months 6 days      
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Vesting period 3 years      
Expiration period 10 years      
Restricted Stock [Member]
       
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 900,573      
Restricted shares granted 398,578      
Restricted shares vested (309,874)      
Restricted shares forfeited (19,500) (5,215) (15,310)  
Restricted shares repurchased (5,165)      
Non-vested restricted shares outstanding 964,612 900,573    
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 $ 19.18      
Weighted Average Share Price, Restriced shares granted $ 26.87      
Weighted Average Share Price, Restricted Shares Vested $ 22.08      
Weighted Average Share Price, Restricted Shares Forfeited $ 23.62      
Weighed Average Share Price, Restricted shares repurchased $ 22.40      
Weighted Average Share Price, Non-vested Restricted Shares, Outstanding $ 23.40 $ 19.18    
Directors' fees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted shares granted 16,078      
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 $ 28.78      
Deferred Director's fees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted shares granted 18,622      
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 $ 28.80      
Performance Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted shares granted 185,915   91,000  
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 $ 26.85   $ 23.11  
Allocated Share-based Compensation Expense $ 1,684 $ 1,702 $ 446  
Minimum [Member] | Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Vesting period 3 years      
Maximum [Member] | Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Vesting period 5 years