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Share-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
plan
Jun. 30, 2013
Jun. 30, 2014
plan
Jun. 30, 2013
Jun. 30, 2014
Stock Awards [Member]
Dec. 31, 2013
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of share-based compensation plans 2   2      
Number of shares authorized under plan 10,400,000   10,400,000      
Share-based compensation expense $ 552 $ 354 $ 2,468 $ 1,750    
Share-based compensation cost capitalized as part of real estate assets 76 55 122 105    
Unrecognized compensation cost related to nonvested stock awards $ 8,815   $ 8,815      
Compensation cost to be recognized over a weighted average period     3 years 9 months      
Nonvested, beginning of period (in shares)         541,186 478,216
Granted (in shares)         236,450  
Vested (in shares)         (165,470)  
Forfeited (in shares)         (8,010)  
Nonvested, end of period (in shares)         541,186 478,216
Weighted average grant date fair value, nonvested, beginning of period (in dollars per share)         $ 18.31 $ 18.72
Weighted average grant date fair value, granted (in dollars per share)         $ 17.11  
Weighted average grant date fair value, vested (in dollars per share)         $ 17.79  
Weighted average grant date fair value, forfeited (in dollars per share)         $ 18.55  
Weighted average grant date fair value, nonvested, end of period (in dollars per share)         $ 18.31 $ 18.72