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Share and Unit-Based Plans: (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2012
Share and Unit-Based Plans: |
Compensation cost under the share and unit-based plans |
|  | For the Three Months Ended March 31, |
--- | --- | --- | ---
|  | 2012 |  | 2011 |
LTIP units |  | $ | 1,547 |  | $ | 1,901 |
Stock awards |  |  | 96 |  |  | 493 |
Stock units |  |  | 2,220 |  |  | 2,813 |
SARs |  |  | — |  |  | 321 |
Phantom stock units |  |  | 254 |  |  | 240 |
|  | $ | 4,117 |  | $ | 5,768 |
Summary of activity of non-vested LTIP Units, stock awards, phantom stock and stock units |
|  | LTIP Units |  | Stock Awards |  | Phantom Stock |  | Stock Units |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  | Units |  | Value(1) |  | Shares |  | Value(1) |  | Units |  | Value(1) |  | Shares |  | Value(1) |
Balance at January 1, 2012 |  |  | 190,000 |  | $ | 43.30 |  |  | 21,130 |  | $ | 40.68 |  |  | 15,745 |  | $ | 34.84 |  |  | 576,340 |  | $ | 11.71 |
Granted(2) |  |  | 285,000 |  |  | 39.61 |  |  | 9,639 |  |  | 54.43 |  |  | 2,134 |  |  | 54.93 |  |  | 72,322 |  |  | 54.43 |
Vested(2) |  |  | (285,000 | ) |  | 43.30 |  |  | (9,511 | ) |  | 35.68 |  |  | (6,066 | ) |  | 41.90 |  |  | (533,985 | ) |  | 15.24 |
Forfeited |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |
Balance at March 31, 2012 |  |  | 190,000 |  | $ | 37.77 |  |  | 21,258 |  | $ | 49.15 |  |  | 11,813 |  | $ | 34.84 |  |  | 114,677 |  | $ | 52.19 |
(1) Value represents the weighted-average grant date fair value. (2) On February 7, 2012, the compensation committee determined that the LTIP Units granted under the LTIP on February 28, 2011 had vested at the 150% level based on the Company's percentile ranking in terms of Total Return per common stock share to the Total Return of a group of peer REITs during the period of February 1, 2011 to January 31, 2012. As a result, the compensation committee granted an additional 95,000 LTIP Units, which vested as of January 31, 2012.
Summary of activity of SARs and stock options outstanding |
|  | SARs |  | Stock Options |
--- | --- | --- | --- | --- | ---
|  | Units |  | Value(1) |  | Shares |  | Value(1) |
Balance at January 1, 2012 |  |  | 1,156,985 |  | $ | 56.55 |  |  | 13,500 |  | $ | 30.08 |
Granted |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at March 31, 2012 |  |  | 1,156,985 |  | $ | 56.55 |  |  | 13,500 |  | $ | 30.08 |
(1) Value represents the weighted-average exercise price.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (h)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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