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Share and Unit-Based Plans: (Tables)
 9 Months Ended
Sep. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
LTIP Units
$
4,743

 
$
2,778

 
$
12,393

 
$
6,646

Stock awards
121

 
125

 
353

 
345

Stock units
674

 
383

 
3,165

 
2,991

Stock options
4

 
18

 
12

 
18

Stock appreciation rights ("SARs")
—

 
210

 
—

 
291

Phantom stock units
248

 
211

 
735

 
721

 
$
5,790

 
$
3,725

 
$
16,658

 
$
11,012
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, 2013
200,000

 
$
38.63

 
20,924

 
$
49.36

 
—

 
$
—

 
114,677

 
$
52.19

Granted
332,189

 
49.67

 
8,963

 
61.84

 
32,063

 
58.94

 
67,920

 
62.01

Vested
(200,000
)
 
38.63

 
(10,886
)
 
46.70

 
(12,377
)
 
59.38

 
(45,279
)
 
51.29

Forfeited
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Balance at September 30, 2013
332,189

 
$
49.67

 
19,001

 
$
56.77

 
19,686

 
$
58.66

 
137,318

 
$
57.24

 
 
 
(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 SARs and stock options outstanding:
 
SARs
 
Stock Options
 
Shares
 
Value(1)
 
Shares
 
Value(1)
Balance at January 1, 2013
1,164,185

 
$
56.66

 
12,768

 
$
54.69

Granted
—

 
—

 
—

 
—

Exercised
(93,194
)
 
56.63

 
(2,700
)
 
36.51

Forfeited
—

 
—

 
—

 
—

Balance at September 30, 2013
1,070,991

 
$
56.66

 
10,068

 
$
59.57

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

(1)
Value represents the weighted-average exercise price.