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Share and Unit-Based Plans - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 06, 2015
$ / shares
shares
Jan. 01, 2015
$ / shares
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
Share and unit-based plans            
Capitalized share and unit-based compensation costs | $     $ 561 $ 519 $ 4,908 $ 4,361
Stock units            
Share and unit-based plans            
Conversion rate of shares         1  
Granted (in shares)         76,340  
Average grant date fair value (in dollars per share) | $ / shares         $ 86.64  
Unrecognized compensation cost of share and unit-based plans | $     5,306   $ 5,306  
LTIP Units            
Share and unit-based plans            
Conversion rate of shares         1  
Granted (in shares)         368,508  
Average grant date fair value (in dollars per share) | $ / shares         $ 75.98  
Total stockholder return requirement (as a percent)         3.00%  
Unrecognized compensation cost of share and unit-based plans | $     11,752   $ 11,752  
Stock awards            
Share and unit-based plans            
Granted (in shares)         0  
Average grant date fair value (in dollars per share) | $ / shares         $ 0.00  
Unrecognized compensation cost of share and unit-based plans | $     75   $ 75  
Stock options            
Share and unit-based plans            
Unrecognized compensation cost of share and unit-based plans | $     35   $ 35  
Phantom stock units            
Share and unit-based plans            
Granted (in shares)         5,460  
Average grant date fair value (in dollars per share) | $ / shares         $ 83.19  
Unrecognized compensation cost of share and unit-based plans | $     $ 268   $ 268  
Executive Officer | LTIP Units            
Share and unit-based plans            
Average grant date fair value (in dollars per share) | $ / shares $ 86.72          
2016 LTIP Units Series 1 | Executive Officer | LTIP Units            
Share and unit-based plans            
Granted (in shares)   49,451        
Average grant date fair value (in dollars per share) | $ / shares   $ 83.41        
2015 LTIP Units Series 2 | Executive Officer | LTIP Units            
Share and unit-based plans            
Granted (in shares)   186,450        
Average grant date fair value (in dollars per share) | $ / shares   $ 66.37        
2015 LTIP Units Series 3 | Executive Officer | LTIP Units            
Share and unit-based plans            
Granted (in shares) 132,607