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Share and Unit-Based Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Compensation cost under the share and unit-based plans
The following summarizes the compensation cost under the share and unit-based plans:
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
LTIP Units
$
5,269

 
$
5,204

 
$
24,892

 
$
27,752

Stock awards
—

 
—

 
—

 
20

Stock units
1,002

 
965

 
4,947

 
5,339

Stock options
34

 
4

 
53

 
12

Phantom stock units
185

 
212

 
545

 
1,010

 
$
6,490

 
$
6,385

 
$
30,437

 
$
34,133
Summary of activity of non-vested LTIP Units, stock awards, phantom stock and stock units
The following table summarizes the activity of the non-vested LTIP Units, phantom stock units and stock units:
 
LTIP Units
 
Phantom Stock Units
 
Stock Units
 
Units
 
Value(1)
 
Units
 
Value(1)
 
Units
 
Value(1)
Balance at January 1, 2017
322,572

 
$
58.18

 
5,845

 
$
81.47

 
148,428

 
$
78.53

Granted
506,906

 
55.33

 
8,439

 
68.34

 
86,426

 
66.47

Vested
(134,742
)
 
66.57

 
(8,166
)
 
71.85

 
(80,804
)
 
75.67

Forfeited
—

 
—

 
—

 
—

 
(2,695
)
 
69.57

Balance at September 30, 2017
694,736

 
$
54.48

 
6,118

 
$
76.20

 
151,355

 
$
73.32

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1) Value represents the weighted average grant date fair value.
Summary of activity of SARs and stock options outstanding
The following table summarizes the activity of the stock appreciations rights ("SARs") and stock options outstanding:
 
SARs
 
Stock Options
 
Units
 
Value(1)
 
Units
 
Value(1)
Balance at January 1, 2017
284,146

 
$
53.85

 
10,565

 
$
56.77

Granted
—

 
—

 
25,000

 
57.55

Exercised
—

 
—

 
—

 
—

Balance at September 30, 2017
284,146

 
$
53.85

 
35,565

 
$
57.32

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1) Value represents the weighted average exercise price.