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Share-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
installments
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Options [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2009
Stock Awards [Member]
Dec. 31, 2012
Stock Awards [Member]
Dec. 31, 2011
Stock Awards [Member]
Dec. 31, 2010
Stock Awards [Member]
Feb. 28, 2013
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares authorized 10,400,000                    
Share-based compensation expense $ 3,704 $ 1,687 $ 2,201                
Income tax effect of share-based compensation 0 0 1,815                
Share-based compensation cost capitalized as part of real estate assets 128 166 169                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]                      
Outstanding, beginning of period (in shares)         281,725            
Cancelled (in shares)         (15,375)            
Exercised (in shares)         (266,350)            
Outstanding, end of period (in shares)         0 281,725          
Vested and exercisable, end of period (in shares)         0            
Options, outstanding, intrinsic value         0            
Options, vested and exercisable, intrinsic value         0            
Total Intrinsic Value       346 177 509          
Weighted average exercise price, outstanding, beginning of period (in dollars per share)         $ 0 $ 18.27          
Weighted average exercise price, cancelled (in dollars per share)         $ 18.27            
Weighted average exercise price, exercised (in dollars per share)         $ 18.27            
Weighted average exercise price, vested and exercisable, end of period (in dollars per share)         $ 0            
Award vesting period 5 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Nonvested, beginning of period (in shares)               289,290      
Granted (in shares)               295,465      
Vested (in shares)               (228,415)      
Forfeited (in shares)               (9,480)      
Nonvested, end of period (in shares)               346,860 289,290    
Weighted average grant-date fair value, nonvested, beginning of period (in dollars per share)               $ 17.06 $ 16.09    
Weighted average grant-date fair value, granted (in dollars per share)             $ 10.34 $ 19.09 $ 17.48    
Weighted average grant-date fair value, vested (in dollars per share)               $ 18.48      
Weighted average grant-date fair value, forfeited (in dollars per share)               $ 16.64      
Unrecognized compensation cost related to nonvested stock awards 3,325                    
Compensation cost to be recognized over a weighted average period 3 years 6 months                    
Total fair value of shares vested               $ 4,573 $ 1,276 $ 914  
Stock grants during the period                     155,400
Number of installments, at the end of award period 1                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration (Years) 10 years