XML 63 R47.htm IDEA: XBRL DOCUMENT v3.3.1.900
Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Stock-based Compensation [Abstract]  
Schedule Of Sharebased Compensation Restricted Operating Partnership Units Earned [Table Text Block]
          
Plan Year Notional Amount Grant-Date Fair Value(1) OPP Units Earned
2015 $ 40,000,000 $ 9,120,000 To be determined in 2017
2014   50,000,000   8,202,000 To be determined in 2016
2013   40,000,000   6,814,000 85,420
2012   40,000,000   12,250,000 303,202
          
          
(1)Such amounts are being amortized into expense over a five-year period from the date of grant, using a graded vesting attribution model. In the years ended December 31, 2015, 2014 and 2013, we recognized $15,531,000, $6,185,000 and $3,226,000, respectively, of compensation expense related to OPPs. As of December 31, 2015, there was $5,087,000 of total unrecognized compensation cost related to the OPPs, which will be recognized over a weighted-average period of 1.7 years.
Schedule Of Share Based Compensation Stock Options Activity [Table Text Block]
         Weighted-    
     Weighted-  Average    
     Average  Remaining Aggregate 
     Exercise   Contractual Intrinsic  
   Shares Price  Term Value 
 Outstanding at January 1, 2015 (1) 2,965,968 $60.82       
 Granted 35,208  112.10       
 Exercised (160,266)  82.21       
 Cancelled or expired (13,340)  100.21       
 Outstanding at December 31, 2015 2,827,570 $60.06  4.0 $ 115,796,000 
 Options vested and expected to vest at            
  December 31, 2015 2,826,685 $60.06  4.0 $ 115,788,000 
 Options exercisable at December 31, 2015 2,741,863 $59.08  3.8 $ 114,653,000 
              
              
 (1)Adjusted for the effect of the UE spin-off.
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block]
  December 31, 
  2015 2014 2013 
 Expected volatility 35.00%  36.00%  36.00% 
 Expected life 5.0 years  5.0 years  5.0 years 
 Risk free interest rate 1.56%  1.81%  0.91% 
 Expected dividend yield 3.30%  4.10%  4.30% 
Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity [Table Text Block]
      Weighted-Average 
      Grant-Date  
 Unvested Shares Shares Fair Value 
 Unvested at January 1, 2015 (1)  24,478 $ 78.32 
 Granted  8,177   110.84 
 Vested  (11,298)   78.08 
 Cancelled or expired  (1,765)   88.69 
 Unvested at December 31, 2015  19,592   91.09 
         
          
 (1)Adjusted for the effect of the UE spin-off. 
Schedule Of Sharebased Compensation Restricted Operating Partnership Units Activity [Table Text Block]
      Weighted-Average 
      Grant-Date 
 Unvested Units Units Fair Value 
 Unvested at January 1, 2015 (1)  721,662 $ 74.38 
 Granted  197,497   102.75 
 Vested  (270,443)   74.22 
 Cancelled or expired  (9,699)   83.89 
 Unvested at December 31, 2015  639,017   83.07 
         
          
 (1)Adjusted for the effect of the UE spin-off.