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Share and Unit-Based Plans - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 04, 2016
$ / shares
shares
Jan. 01, 2016
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
Share and unit-based plans        
Capitalized share and unit-based compensation costs | $     $ 4,959 $ 4,347
Stock units        
Share and unit-based plans        
Conversion rate of shares     1  
Granted (in shares) | shares     85,045  
Average grant date fair value (in dollars per share) | $ / shares     $ 79.24  
Unrecognized compensation cost of share and unit-based plans | $     $ 6,628  
LTIP Units        
Share and unit-based plans        
Conversion rate of shares     1  
Granted (in shares) | shares     480,371  
Average grant date fair value (in dollars per share) | $ / shares     $ 65.00  
Risk free rate (as a percent)   1.32%    
Volatility (as a percent)   20.31%    
Unrecognized compensation cost of share and unit-based plans | $     $ 17,955  
Stock options        
Share and unit-based plans        
Unrecognized compensation cost of share and unit-based plans | $     $ 23  
Phantom stock units        
Share and unit-based plans        
Granted (in shares) | shares     14,534  
Average grant date fair value (in dollars per share) | $ / shares     $ 80.42  
Unrecognized compensation cost of share and unit-based plans | $     $ 746  
LTIP units that vest in equal installments over a service period ending December 31, 2016 | LTIP Units        
Share and unit-based plans        
Granted (in shares) | shares   58,786    
Average grant date fair value (in dollars per share) | $ / shares   $ 80.69    
Market-Indexed LTIP units that vest in equal installments over a service period ending December 31, 2016 | LTIP Units        
Share and unit-based plans        
Granted (in shares) | shares   266,899    
Average grant date fair value (in dollars per share) | $ / shares   $ 53.32    
LTIP units that are fully vested on the grant date | LTIP Units        
Share and unit-based plans        
Granted (in shares) | shares 154,686      
Average grant date fair value (in dollars per share) | $ / shares $ 79.20