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Share and Unit-Based Plans: (Tables)
 3 Months Ended
Mar. 31, 2016
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 March 31,
 
2016
 
2015
LTIP Units
$
17,399

 
$
15,228

Stock awards
20

 
75

Stock units
3,372

 
3,197

Stock options
4

 
4

Phantom stock units
604

 
311

 
$
21,399

 
$
18,815
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, stock awards, phantom stock units and stock units:
 
LTIP Units
 
Stock Awards
 
Phantom Stock Units
 
Stock Units
 
Units
 
Value(1)
 
Shares
 
Value(1)
 
Units
 
Value(1)
 
Units
 
Value(1)
Balance at January 1, 2016
56,315

 
$
73.24

 
1,612

 
$
62.01

 
—

 
$
—

 
132,086

 
$
74.58

Granted
480,371

 
65.00

 
—

 
—

 
14,534

 
80.42

 
85,045

 
79.24

Vested
(154,686
)
 
79.20

 
(1,612
)
 
62.01

 
(5,237
)
 
80.83

 
(67,703
)
 
71.64

Forfeited
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Balance at March 31, 2016
382,000

 
$
60.47

 
—

 
$
—

 
9,297

 
$
80.20

 
149,428

 
$
78.55

 
 
 
(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, 2016
417,783

 
$
55.13

 
10,314

 
$
58.15

Granted
—

 
—

 
—

 
—

Exercised
(25,988
)
 
52.77

 
—

 
—

Special dividend adjustment
10,185

 
53.88

 
251

 
56.77

Balance at March 31, 2016
401,980

 
$
53.88

 
10,565

 
$
56.77

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1)    Value represents the weighted average exercise price.