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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation Arrangement by Share-based Payment Award Restricted Profits Units, Vested and Expected to Vest [Table Text Block]
Restricted TRG Profits Units

 
Number of Restricted TRG Profits Units
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2017
45,940

 
$
59.49

Granted
46,076

 
57.84

Forfeited
(30,885
)
 
57.85

Outstanding at December 31, 2017
61,131

 
$
59.08

Granted
8,154

 
49.29

Outstanding at December 31, 2018
69,285

 
$
57.93

Units recovered and cancelled (1)
(368
)
 
59.49

Vested and converted (2)
(46,506
)
 
59.45

Outstanding at December 31, 2019
22,411

 
$
54.73


(1)
This reflects the recovery and cancellation of previously granted Restricted TRG Profits Units, which vested on March 1, 2019, as a result of the actual cash distributions made during the vesting period.
(2)
This represents the conversion of Restricted TRG Profits Units to TRG Units, which satisfied certain tax-driven requirements on April 1, 2019 and had previously vested.
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, TSR Performance-Based Profits Units, Vested and Expected to Vest [Table Text Block]
Relative TSR Performance-based TRG Profits Units

 
Number of relative TSR Performance-based TRG Profits Units
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2017
103,369

 
$
26.42

Granted
103,666

 
23.14

Forfeited
(77,302
)
 
23.42

Outstanding at December 31, 2017
129,733

 
$
25.59

Granted
18,345

 
22.22

Outstanding at December 31, 2018
148,078

 
$
25.17

Units recovered and cancelled (1)
(76,489
)
 
26.42

Vested and converted (2)
(21,169
)
 
26.30

Outstanding at December 31, 2019
50,420

 
$
22.81


(1)
This reflects the recovery and cancellation of previously granted (300% of target grant amount) Relative TSR Performance-based TRG Profits Units, which vested on March 1, 2019, as a result of the performance payout ratio of 22% and the actual cash distributions made during the vesting period. That is, despite the completion of applicable employee service requirements, the number of Relative TSR Performance-based TRG Profits Units ultimately considered earned is determined by the extent to which the TSR market performance measure was achieved during the performance period.
(2)
This represents the conversion of Restricted TRG Profits Units to TRG Units, which satisfied certain tax-driven requirements on April 1, 2019 and had previously vested.
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, NOI Performance-Based Profits Units, Vested and Expected to Vest1 [Table Text Block]
NOI Performance-based TRG Profits Units

 
Number of NOI Performance-based TRG Profits Units
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2017
103,369

 
$
41.87

Granted
103,666

 
19.35

Forfeited
(75,431
)
 
20.59

Outstanding at December 31, 2017
131,604

 
$
19.69

Granted
18,345

 
16.43

Outstanding at December 31, 2018
149,949

 
$
19.29

Units recovered and cancelled (1)
(68,730
)
 
17.47

Vested and converted (2)
(30,799
)
 
18.86

Outstanding at December 31, 2019
50,420

 
$
2.99


(1)
This reflects the recovery and cancellation of previously granted (300% of target grant amount) NOI Performance-based TRG Profits Units, which vested on March 1, 2019, as a result of the performance payout ratio of 30% and the actual cash distributions made during the vesting period. That is, despite the completions of applicable employee service requirements, the number of NOI Performance-based TRG Profits Units ultimately considered earned is determined by the extent to which the NOI performance measure was achieved during the performance period.
(2)
This represents the conversion of Restricted TRG Profits Units to TRG Units, which satisfied certain tax-driven requirements on April 1, 2019 and had previously vested.
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
TSR - Based Performance Share Units

 
Number of TSR PSU
 
Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017
166,027

 
$
138.93

Granted
5,046

 
80.16

Vested - three-year grants
(50,459
)
(1) 
90.51

Vested - 2012 and 2013 special grants
(79,764
)
(2) 
181.99

Outstanding at December 31, 2017
40,850


$
107.38

Granted
10,393


78.82

Vested
(37,046
)
(3) 
110.09

Outstanding at December 31, 2018
14,197


$
79.13

Granted
20,936


85.44

Forfeited
(5,758
)
 
82.59

Outstanding at December 31, 2019
29,375


$
82.95



(1)
Based on our market performance relative to that of a peer group, the actual number of shares of common stock issued upon vesting during the year ended December 31, 2017 was 30,601 shares for the TSR PSU three-year grants. The shares of common stock were issued at a weighted average rate of 0.60x and in the range of 0.00x to 1.00x. That is, despite the completion of the 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. Included in the vested PSUs are awards that vested early due to a retirement and as a result of our restructuring and reduction in our workforce (Note 1).
(2)
Based on our market performance relative to that of a peer group, the actual number of shares of common stock issued upon vesting during the year ended December 31, 2017 was zero shares for the 2012 and 2013 TSR PSU special grants. That is, despite the completion of the 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.
(3)
Based on our market performance relative to that of a peer group, the actual number of shares of common stock issued upon vesting during the year ended December 31, 2018 was 45,941 shares for the TSR PSU three-year grants. The shares of common stock were issued at a rate of 1.24x. That is, despite the completion of the 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 NOI Performance-based Units Activity [Table Text Block]
NOI - Based Performance Share Units
 
Number of NOI PSU
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2017
—

 
$
—

Granted
5,046

 
67.04

Vested
(1,242
)
(1) 
67.50

Outstanding at December 31, 2017
3,804

 
$
67.00

Granted
10,393

 
58.28

Outstanding at December 31, 2018
14,197

 
$
60.59

Granted
20,936

 
52.41

Forfeited
(5,758
)
 
57.42

Outstanding at December 31, 2019
29,375

 
$
40.95


(1)
The actual number of shares of common stock issued upon vesting during the year ended December 31, 2017 was 1,242 shares (1.0x). That is, despite the completion of applicable employee service requirements, the number of shares ultimately considered earned is determined by the extent to which NOI was achieved during the performance period. These NOI PSU vested as a result of our restructuring and reduction in our workforce (Note 1).
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Restricted Share Units
 
Number of RSU
 
Weighted average Grant Date Fair Value
Outstanding at January 1, 2017
231,903

 
$
70.40

Granted
102,568

 
63.33

Forfeited
(12,499
)
 
67.78

Vested
(126,951
)
 
66.98

Outstanding at December 31, 2017
195,021


$
69.22

Granted
69,931


58.28

Forfeited
(6,985
)

63.21

Vested
(73,294
)

73.91

Outstanding at December 31, 2018
184,673


$
63.44

Granted
87,720


52.41

Forfeited
(19,249
)

57.90

Vested
(73,298
)

66.22

Outstanding at December 31, 2019
179,846


$
57.73

 
 
 
 
Fully vested at December 31, 2019
10,133

(1) 
58.75


(1)
These RSU were vested and outstanding as of December 31, 2019. The related shares were issued on January 3, 2020.
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Options

Options were granted to purchase TRG Units, which are exchangeable for new shares of our common stock under the Continuing Offer (Note 15). The options had ten-year contractual terms.
 
Number of Options
 
Weighted Average
 Exercise Price
 
Weighted Average Remaining Contractual Term (in years)
 
Range of Exercise Prices
 
Outstanding at January 1, 2017
202,586
 
$
48.35

 
0.7
 
$
45.9

-
$
51.15

 
Exercised
(202,586)
 
48.35

 
 
 
 
 
 
 
Outstanding at December 31, 2017
0
 
$
—