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Equity Incentive Plan (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Equity Incentive Plan        
Maximum number of common shares of beneficial interest to be issued (in shares) 5,000,000   5,000,000  
Summary of non-vested shares/units        
Granted (in shares)     3,360  
Weighted Average Grant Date Fair Value        
Granted (in dollars per share)       $ 28.07
Other Disclosures        
Share-based compensation expense     $ 94,000 $ 96,000
Restricted share awards
       
Summary of non-vested shares/units        
Unvested at the beginning of the period (in shares)     932,800  
Granted (in shares)     347,247 [1]  
Vested (in shares)     (398,599) [1]  
Forfeited (in shares)     (8,716)  
Unvested at the end of the period (in shares) 872,732   872,732  
Weighted Average Grant Date Fair Value        
Unvested at the beginning of the period (in dollars per share)     $ 18.99  
Granted (in dollars per share)     $ 24.44 [1]  
Vested (in dollars per share)     $ 19.34 [1]  
Forfeited (in dollars per share)     $ 23.06  
Unvested at the end of the period (in dollars per share) $ 20.96   $ 20.96  
Other Disclosures        
Share-based compensation expense 2,700,000 2,200,000 7,900,000 6,300,000
Total unrecognized compensation costs 17,000,000   17,000,000  
Weighted-average period of recognition of unrecognized share-based compensation expense     2 years 3 months  
Total fair value of shares vested     11,000,000  
Performance Units
       
Summary of non-vested shares/units        
Unvested at the end of the period (in shares) 1,000,000   1,000,000  
Weighted Average Grant Date Fair Value        
Unvested at the end of the period (in dollars per share) $ 15.36   $ 15.36  
Other Disclosures        
Share-based compensation expense 1,100,000 1,100,000   3,400,000
Total unrecognized compensation costs $ 5,600,000   $ 5,600,000  
Weighted-average period of recognition of unrecognized share-based compensation expense     1 year 3 months  
Vesting period     4 years  
Measurement period     3 years  
Time-based vesting period     1 year  
Common shares available for future grant (in share) 2,739,596   2,739,596  
[1] Includes 3,360 unrestricted shares issued in lieu of cash compensation to non-employee trustees at a weighted-average grant date fair value of $28.07.