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Stock Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
LTIP
Mar. 31, 2014
LTIP
Senior management
Mar. 31, 2014
Market-based LTIP Units
Nov. 30, 2013
Market-based LTIP Units
Nov. 30, 2013
Market-based LTIP Units
Senior management
Mar. 31, 2014
Restricted common stock
Nov. 30, 2013
Percent Vesting Based on TSR [Member]
Maximum
Market-based LTIP Units
Nov. 30, 2013
Percent Vesting Based on Relative Outperformance of TSR Compared to Percentage Change of Index [Member]
Maximum
Market-based LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares of common stock available for grant 1,500,000                  
2012 Equity Incentive Plan expiration date May 11, 2022                  
Stock compensation for common stock available for grant 504,212                  
Stock-based compensation cost $ 0.7 $ 0.7                
Unrecognized compensation cost related to unvested LTIP units     1.8   1.6     0.6    
Weighted average period over which unrecognized compensation is expected to be recognized     1 year 4 months 25 days   4 years 45 days     2 years    
Vesting period               3 years    
LTIP units and shares of restricted common stock, issued       78,272     338,094      
TSR requirement for vesting period                 50.00% 50.00%
Aggregate grant date fair value           $ 1.9