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Share-Based Compensation Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 27, 2015
Feb. 11, 2015
Feb. 04, 2014
Dec. 13, 2013
Jan. 30, 2013
Feb. 08, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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             762,013    
Operating Partnership outstanding             236,351 236,351  
LTIP units, vested             9,469    
Restricted Stock [Member]                  
Share-Based Compensation Plan (Textual) [Abstract]                  
Allocated Share-based Compensation Expense             $ 1.6 $ 1.4 $ 1.5
Total unrecognized compensation cost             $ 2.7    
Weighted average remaining vesting period (in years)             2 years 6 months    
Share-based equity award grant             46,446 44,322 84,451
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period             50,827 62,047 65,192
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             $ 5.6 $ 7.7 $ 2.1
Total unrecognized compensation cost             $ 10.2    
Weighted average remaining vesting period (in years)             1 year 9 months    
LongTermIncentivePartnershipUnitsClassA [Member]                  
Share-Based Compensation Plan (Textual) [Abstract]                  
Value of LTIP grants per share             $ 8.50    
LTIP units, vested             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             $ 1.1 $ 2.6 $ 1.6
Total unrecognized compensation cost             $ 4.4    
Weighted average remaining vesting period (in years)             2 years    
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%              
July 2015 [Member] | Performance Shares [Member]                  
Share-Based Compensation Plan (Textual) [Abstract]                  
Share-based equity award grant 771                
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