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Share and Unit-Based Plans: (Tables)
 3 Months Ended
Mar. 31, 2015
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,
 
 
2015
 
2014
LTIP Units
 
$
15,228

 
$
18,240

Stock awards
 
75

 
114

Stock units
 
3,197

 
1,682

Stock options
 
4

 
4

Phantom stock units
 
311

 
306

 
 
$
18,815

 
$
20,346
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, 2015
46,695

 
$
58.89

 
9,189

 
$
59.25

 
9,269

 
$
58.35

 
144,374

 
$
59.94

Granted
368,508

 
75.98

 
—

 
—

 
3,185

 
84.97

 
75,171

 
86.72

Vested
(132,607
)
 
86.72

 
(6,201
)
 
58.00

 
(4,350
)
 
71.53

 
(80,334
)
 
59.06

Forfeited
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Balance at March 31, 2015
282,596

 
$
68.12

 
2,988

 
$
61.84

 
8,104

 
$
61.73

 
139,211

 
$
74.94

 
 
 
(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
 
Shares
 
Value(1)
 
Shares
 
Value(1)
Balance at January 1, 2015
772,639

 
$
56.67

 
10,068

 
$
59.57

Granted
—

 
—

 
—

 
—

Exercised
(342,981
)
 
56.88

 
—

 
—

Forfeited
—

 
—

 
—

 
—

Balance at March 31, 2015
429,658

 
$
56.50

 
10,068

 
$
59.57

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1)
Value represents the weighted average exercise price.