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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of option activity for the six months ended June 30, 2016 is presented below:
 
Number of Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (in years)
 
Range of Exercise Prices
Outstanding at January 1, 2016
292,543

 
$
46.60

 
1.4
 
$
35.50

-
$
51.15

Exercised
(89,957
)
 
42.66

 
 
 
 
 
 
Outstanding at June 30, 2016
202,586

 
$
48.35

 
1.2
 
$
45.90

-
$
51.15

 
 
 
 
 
 
 
 
 
 
Fully vested options at June 30, 2016
202,586

 
$
48.35

 
1.2
 
 

 
 
Schedule of Share-based Compensation Arrangement by Share-based Payment Award Restricted Profits Units, Vested and Expected to Vest [Table Text Block]
A summary of Restricted TRG Profits Units activity for the six months ended June 30, 2016 is presented below:
 
Number of Restricted TRG Profits Units
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2016
—

 
$
—

Granted
68,045

 
59.89

Outstanding at June 30, 2016
68,045

 
$
59.89
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, TSR Performance-Based Profits Units, Vested and Expected to Vest [Table Text Block]
A summary of relative TSR Performance-based TRG Profits Units activity for the six months ended June 30, 2016 is presented below:
 
Number of relative TSR Performance-based TRG Profits Units
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2016
—

 
$
—

Granted
119,123

 
26.42

Outstanding at June 30, 2016
119,123

 
$
26.42
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, NOI Performance-Based Profits Units, Vested and Expected to Vest1 [Table Text Block]
A summary of NOI Performance-based TRG Profits Units activity for the six months ended June 30, 2016 is presented below:
 
Number of NOI Performance-based TRG Profits Units

 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2016
—

 
$
—

Granted (1)
119,123

 
19.41

Outstanding at June 30, 2016
119,123

 
$
19.41
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
A summary of PSU activity for the six months ended June 30, 2016 is presented below:
 
Number of Performance Share Units
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2016
255,478

 
$
134.52

Vested
(44,866
)
(1) 
96.61

Forfeited
(33,529
)
 
142.69

Outstanding at June 30, 2016
177,083

 
$
142.59



(1)
Based on the Company's market performance relative to that of a peer group, the actual number of shares of common stock issued upon vesting during the six months ended June 30, 2016 was zero. That is, despite the completion of applicable employee service requirements, the number of shares ultimately considered earned is determined by the extent to which the TSR market performance measure was achieved during the performance period.
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
A summary of RSU activity for the six months ended June 30, 2016 is presented below:
 
Number of Restricted Share Units
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2016
283,353

 
$
69.93

Vested
(88,469
)
 
71.58

Granted
55,888

 
73.42

Forfeited
(16,282
)
 
69.13

Outstanding at June 30, 2016
234,490

 
$
70.20