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Share and Unit-Based Plans - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 06, 2015
$ / shares
shares
Jan. 01, 2015
$ / shares
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Share and unit-based plans            
Capitalized share and unit-based compensation costs | $     $ 551 $ 525 $ 5,459 $ 4,886
Stock units            
Share and unit-based plans            
Conversion rate of shares         1  
Granted (in shares) | shares         76,531  
Average grant date fair value (in dollars per share)         $ 86.61  
Unrecognized compensation cost of share and unit-based plans | $     4,251   $ 4,251  
LTIP Units            
Share and unit-based plans            
Conversion rate of shares         1  
Granted (in shares) | shares         368,508  
Average grant date fair value (in dollars per share)         $ 75.98  
Total stockholder return requirement (as a percent)         3.00%  
Risk free rate (as a percent)         0.25%  
Volatility (as a percent)         16.81%  
Unrecognized compensation cost of share and unit-based plans | $     7,940   $ 7,940  
Stock awards            
Share and unit-based plans            
Granted (in shares) | shares         0  
Average grant date fair value (in dollars per share)         $ 0.00  
Unrecognized compensation cost of share and unit-based plans | $     48   $ 48  
Stock options            
Share and unit-based plans            
Unrecognized compensation cost of share and unit-based plans | $     31   $ 31  
Phantom stock units            
Share and unit-based plans            
Granted (in shares) | shares         7,056  
Average grant date fair value (in dollars per share)         $ 80.68  
Unrecognized compensation cost of share and unit-based plans | $     $ 135   $ 135  
2015 LTIP Units Series 1 | Executive Officer | LTIP Units            
Share and unit-based plans            
Granted (in shares) | shares   49,451        
Average grant date fair value (in dollars per share)   $ 83.41        
2015 LTIP Units Series 2 | Executive Officer | LTIP Units            
Share and unit-based plans            
Granted (in shares) | shares   186,450        
Average grant date fair value (in dollars per share)   $ 66.37        
2015 LTIP Units Series 3 | Executive Officer | LTIP Units            
Share and unit-based plans            
Granted (in shares) | shares 132,607          
Average grant date fair value (in dollars per share) $ 86.72