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Share and Unit-Based Plans: (Tables)
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
LTIP Units
$
3,465

 
$
4,743

 
$
25,133

 
$
12,393

Stock awards
84

 
121

 
281

 
353

Stock units
1,134

 
674

 
3,775

 
3,165

Stock options
4

 
4

 
12

 
12

Phantom stock units
296

 
248

 
902

 
735

 
$
4,983

 
$
5,790

 
$
30,103

 
$
16,658
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, 2014
—

 
$
—

 
19,001

 
$
56.77

 
17,575

 
$
58.66

 
137,318

 
$
57.24

Granted
589,443

 
53.18

 
—

 
—

 
8,916

 
62.53

 
70,505

 
60.24

Vested
(246,471
)
 
60.25

 
(9,812
)
 
54.45

 
(14,548
)
 
61.27

 
(68,151
)
 
55.10

Forfeited
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Balance at September 30, 2014
342,972

 
$
48.11

 
9,189

 
$
59.25

 
11,943

 
$
58.36

 
139,672

 
$
59.80

 
 
 
(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, 2014
1,070,991

 
$
56.66

 
10,068

 
$
59.57

Granted
—

 
—

 
—

 
—

Exercised
(54,082
)
 
56.63

 
—

 
—

Forfeited
—

 
—

 
—

 
—

Balance at September 30, 2014
1,016,909

 
$
56.66

 
10,068

 
$
59.57

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1)
Value represents the weighted average exercise price.