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Share-Based Compensation (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2015
$ / shares
shares
Sep. 30, 2015
USD ($)
plan
$ / shares
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
installment
plan
$ / shares
shares
Sep. 30, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of share-based compensation plans | plan   2   2  
Number of shares authorized under plan   10,400,000   10,400,000  
Share-based compensation cost capitalized as part of real estate assets | $   $ 60,000 $ 77,000 $ 213,000 $ 200,000
Weighted Average Grant-Date Fair Value          
Unrecognized compensation cost related to nonvested stock awards | $   8,774   $ 8,774  
Compensation cost to be recognized over a weighted average period       3 years 4 months 20 days  
Restricted Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense | $   $ 692,000 $ 628,000 $ 3,615,000 $ 3,095,000
Shares          
Nonvested, beginning of period (in shares)       498,862  
Granted (in shares)       267,410  
Vested (in shares)       (192,135)  
Forfeited (in shares)       (6,780)  
Nonvested, end of period (in shares)   567,357   567,357  
Weighted Average Grant-Date Fair Value          
Weighted average grant date fair value, nonvested, beginning of period (in dollars per share) | $ / shares       $ 18.35  
Weighted average grant date fair value, granted (in dollars per share) | $ / shares       20.30  
Weighted average grant date fair value, vested (in dollars per share) | $ / shares       18.77  
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares       19.43  
Weighted average grant date fair value, nonvested, end of period (in dollars per share) | $ / shares   $ 19.11   $ 19.11  
Number of annual installment for awards to vest | installment       5  
Performance Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense | $   $ 156,000   $ 468,000  
Shares          
Granted (in shares) 138,680        
Weighted Average Grant-Date Fair Value          
Weighted average grant date fair value, granted (in dollars per share) | $ / shares $ 15.52        
Unrecognized compensation cost related to nonvested stock awards | $   $ 1,684,000   $ 1,684,000  
Performance period (in years)       3 years  
Vested at conclusion of performance period          
Weighted Average Grant-Date Fair Value          
Vesting percentage 60.00%        
Remaining percentage after performance period          
Weighted Average Grant-Date Fair Value          
Vesting percentage 40.00%        
Vested each year for the first two anniversaries after conclusion of performance period          
Weighted Average Grant-Date Fair Value          
Vesting percentage 20.00%