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Share-Based Compensation Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 11, 2015
Feb. 04, 2014
Dec. 13, 2013
Jan. 30, 2013
Feb. 08, 2012
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based award vesting period               6 years    
Number of common shares available for issuance under the 2009 Equity Incentive Plan           767,952   767,952    
Operating Partnership outstanding           236,351   236,351   236,351
LTIP units, vested           9,469   9,469    
Restricted Stock [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Allocated Share-based Compensation Expense           $ 0.4 $ 0.4 $ 0.8 $ 0.7  
Total unrecognized compensation cost           3.3   $ 3.3    
Weighted average remaining vesting period (in years)               2 years 9 months    
Share-based equity award grant               40,507    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period               50,827    
Restricted Stock [Member] | Minimum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based award vesting period               3 years    
Restricted Stock [Member] | Maximum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based award vesting period               5 years    
Performance Shares [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Allocated Share-based Compensation Expense           1.5 1.1 $ 3.0 2.7  
Total unrecognized compensation cost           $ 13.7   $ 13.7    
Weighted average remaining vesting period (in years)               2 years 2 months    
LongTermIncentivePartnershipUnitsClassA [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Value of LTIP grants per share           $ 8.50   $ 8.50    
LTIP units, vested           9,469   9,469    
LongtermincentivepartnershipunitsclassB [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Value of LTIP grants per share     $ 29.19              
LTIP Units Granted     226,882              
Grant date fair value of performance-based equity awards     $ 6.6              
Long Term Incentive Partnership Units [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Allocated Share-based Compensation Expense           $ 0.3 $ 0.7 $ 0.6 $ 1.3  
Total unrecognized compensation cost           $ 4.9   $ 4.9    
Weighted average remaining vesting period (in years)               2 years 3 months    
February 2012 [Member] | Performance Shares [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based equity award grant         72,056          
January 2013 [Member] | Performance Shares [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based equity award grant       72,118            
Shares Expected to Vest Not Subject to Maximum       11,753            
January 2013 [Member] | Performance Shares [Member] | Minimum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Estimated Shares Expected to Vest Minimum and Maximum       0.00%            
January 2013 [Member] | Performance Shares [Member] | Maximum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Estimated Shares Expected to Vest Minimum and Maximum       200.00%            
December 2013 [Member] | Performance Shares [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based equity award grant     252,088              
December 2013 [Member] | Performance Shares [Member] | Minimum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Estimated Shares Expected to Vest Minimum and Maximum     0.00%              
December 2013 [Member] | Performance Shares [Member] | Maximum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Estimated Shares Expected to Vest Minimum and Maximum     200.00%              
February 2014 [Member] | Performance Shares [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based equity award grant   66,483                
Shares Expected to Vest Not Subject to Maximum   12,261                
February 2014 [Member] | Performance Shares [Member] | Minimum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Estimated Shares Expected to Vest Minimum and Maximum   0.00%                
February 2014 [Member] | Performance Shares [Member] | Maximum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Estimated Shares Expected to Vest Minimum and Maximum   200.00%                
February 2015 [Member] | Performance Shares [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based equity award grant 44,962                  
Shares Expected to Vest Not Subject to Maximum 8,559                  
February 2015 [Member] | Performance Shares [Member] | Minimum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Estimated Shares Expected to Vest Minimum and Maximum 0.00%                  
February 2015 [Member] | Performance Shares [Member] | Maximum [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Estimated Shares Expected to Vest Minimum and Maximum 200.00%                  
Officer Awards [Member] | February 2012 [Member] | Performance Shares [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period               120,016    
Nonexecutive management award [Member] | February 2012 [Member] | Performance Shares [Member]                    
Share-Based Compensation Plan (Textual) [Abstract]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period               87,556