Shareholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | ||||||||||||||
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Jun. 30, 2013
|
Jun. 30, 2014
|
Jun. 30, 2013
|
Dec. 31, 2013
|
Jun. 06, 2014
RMR
|
May 08, 2014
RMR
|
Apr. 07, 2014
RMR
|
Mar. 07, 2014
RMR
|
Feb. 07, 2014
RMR
|
Jun. 30, 2014
RMR
|
Jul. 09, 2014
RMR
Subsequent Event
|
Jun. 30, 2014
Equity compensation plan
Officers and employees
RMR
|
May 14, 2014
Series D
|
Feb. 15, 2014
Series D
|
Jun. 30, 2014
Series D
|
Jul. 25, 2014
Series D
Subsequent Event
|
Jul. 25, 2014
Series D
Subsequent Event
Accrued dividend from February 15, 2014 to May 14, 2014
|
Jul. 25, 2014
Series D
Subsequent Event
Accrued dividend from May 15, 2014 to August 14, 2014
|
Feb. 15, 2014
Series E
|
Jun. 30, 2014
Series E
|
Jul. 25, 2014
Series E
Subsequent Event
|
Jul. 25, 2014
Series E
Subsequent Event
Accrued dividend from February 15, 2014 to May 14, 2014
|
Jul. 25, 2014
Series E
Subsequent Event
Accrued dividend from May 15, 2014 to August 14, 2014
|
Feb. 21, 2014
Common Shares
|
Jun. 30, 2014
Common Shares
|
May 14, 2014
Common Shares
|
Jan. 28, 2014
Common Shares
Trustees
trustee
|
Mar. 25, 2014
Common Shares
Equity compensation plan
Officers and employees
RMR
|
Jun. 30, 2014
Series D Convertible Preferred Shares
|
|
Shareholders' Equity | |||||||||||||||||||||||||||||
Common shares issued | 11,729 | 11,275 | 11,410 | 10,625 | 12,187 | 68,206 | 10,980 | ||||||||||||||||||||||
Shares of beneficial interest granted | 2,000 | ||||||||||||||||||||||||||||
Par value of shares of beneficial interest (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 | ||||||||||||||||||||||||||
Price per common share (in dollars per share) | $ 23.46 | ||||||||||||||||||||||||||||
Number of former trustees to whom common shares granted | 2 | ||||||||||||||||||||||||||||
Common shares issued to holders of preferred shares | 10,411,779 | ||||||||||||||||||||||||||||
Preferred shares converted into common shares | 10,263,003 | ||||||||||||||||||||||||||||
Shares issued | 130,914 | ||||||||||||||||||||||||||||
Compensation expense | $ 3.4 | ||||||||||||||||||||||||||||
Cash distributions paid on preferred shares (in dollars per share) | $ 0.4063 | $ 0.4531 | |||||||||||||||||||||||||||
Distribution paid or declared on preferred shares | 6.2 | 5.0 | |||||||||||||||||||||||||||
Additional distributions on common stock declared (in dollars per share) | $ 0.25 | $ 0.25 | $ 0.50 | $ 0.25 | |||||||||||||||||||||||||
Distributions paid or declared on common shares | 29.6 | ||||||||||||||||||||||||||||
Distributions in arrears | 3.0 | 7.5 | |||||||||||||||||||||||||||
Distributions in arrears (in dollars per share) | $ 0.6094 | $ 0.6797 | |||||||||||||||||||||||||||
Dividend declared (in dollars per share) | $ 0.8125 | $ 0.90625 | |||||||||||||||||||||||||||
Accrued dividend (in dollars per share) | $ 0.40625 | $ 0.40625 | $ 0.453125 | $ 0.453125 | |||||||||||||||||||||||||
Distribution on conversion of preferred shares excess of the market value of the common shares issued above the carrying value of preferred shares | $ 16.2 | ||||||||||||||||||||||||||||
Liquidation preference (in dollars per share) | $ 25.00 | ||||||||||||||||||||||||||||
Percentage of average closing market price of the entity's common stock based on which ratio for conversion of preferred shares into common shares is determined | 98.00% | ||||||||||||||||||||||||||||
Number of consecutive trading days considered for calculating the average of the closing sale prices of the common shares | 5 days | ||||||||||||||||||||||||||||
Number of shares per $25.00 liquidation preference considered for calculating the Fundamental Change Conversion Rate | 1.0145 | ||||||||||||||||||||||||||||
Common shares from conversion of preferred shares | 10,263,003 | 2,363,969 | 10,411,779 | 4,916,997 |