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Share and Unit-Based Plans: (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Share and Unit-Based Plans: |
Summary of activity of non-vested stock awards |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |
Balance at beginning of year |  |  | 63,351 |  | $ | 53.69 |  |  | 126,137 |  | $ | 69.53 |  |  | 275,181 |  | $ | 74.68 |
Granted |  |  | 11,350 |  |  | 48.47 |  |  | 11,664 |  |  | 38.58 |  |  | 6,500 |  |  | 8.21 |
Vested |  |  | (53,571 | ) |  | 57.36 |  |  | (74,143 | ) |  | 78.48 |  |  | (155,077 | ) |  | 76.09 |
Forfeited |  |  | — |  |  | — |  |  | (307 | ) |  | 61.17 |  |  | (467 | ) |  | 70.19 |
Balance at end of year |  |  | 21,130 |  | $ | 40.68 |  |  | 63,351 |  | $ | 53.69 |  |  | 126,137 |  | $ | 69.53 |
Summary of activity of non-vested stock units |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value |
Balance at beginning of year |  |  | 1,038,549 |  | $ | 7.17 |  |  | 1,567,597 |  | $ | 7.17 |  |  | — |  | $ | — |
Granted |  |  | 64,463 |  |  | 48.36 |  |  | — |  |  | — |  |  | 1,600,002 |  |  | 7.17 |
Vested |  |  | (519,272 | ) |  | 7.17 |  |  | (529,048 | ) |  | 7.17 |  |  | (32,405 | ) |  | 7.17 |
Forfeited |  |  | (7,400 | ) |  | 12.35 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year |  |  | 576,340 |  | $ | 11.71 |  |  | 1,038,549 |  | $ | 7.17 |  |  | 1,567,597 |  | $ | 7.17 |
Summary of activity of SARs awards |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price |
Balance at beginning of year |  |  | 1,242,314 |  | $ | 56.56 |  |  | 1,324,700 |  | $ | 56.56 |  |  | 1,326,792 |  | $ | 56.63 |
Granted |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 31,323 |  | $ | 53.72 |
Exercised |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited |  |  | (85,329 | ) | $ | 56.63 |  |  | (82,386 | ) | $ | 56.63 |  |  | (33,415 | ) | $ | 56.63 |
Balance at end of year |  |  | 1,156,985 |  | $ | 56.55 |  |  | 1,242,314 |  | $ | 56.56 |  |  | 1,324,700 |  | $ | 56.56 |
Summary of activity of non-vested LTIP Units |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value |
Balance at beginning of year |  |  | 272,226 |  | $ | 50.68 |  |  | 252,940 |  | $ | 55.50 |  |  | 299,350 |  | $ | 57.02 |
Granted |  |  | 422,631 |  |  | 46.48 |  |  | 232,632 |  |  | 48.89 |  |  | — |  |  | — |
Vested |  |  | (504,857 | ) |  | 49.85 |  |  | (213,346 | ) |  | 54.45 |  |  | (46,410 | ) |  | 65.29 |
Forfeited |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year |  |  | 190,000 |  | $ | 43.30 |  |  | 272,226 |  | $ | 50.68 |  |  | 252,940 |  | $ | 55.50 |
Summary of activity of stock options |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |
Balance at beginning of year |  |  | 110,711 |  | $ | 75.08 |  |  | 110,711 |  | $ | 75.08 |  |  | 110,711 |  | $ | 75.08 |
Granted |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited |  |  | (108,011 | ) | $ | 76.05 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year |  |  | 2,700 |  | $ | 36.51 |  |  | 110,711 |  | $ | 75.08 |  |  | 110,711 |  | $ | 75.08 |
Summary of activity of non-vested phantom stock units |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value |  | Units |  | Weighted Average Grant Date Fair Value |
Balance at beginning of year |  |  | 29,783 |  | $ | 34.18 |  |  | — |  | $ | — |  |  | 3,209 |  | $ | 83.88 |
Granted |  |  | 10,534 |  |  | 48.51 |  |  | 54,602 |  |  | 35.33 |  |  | 25,036 |  |  | 14.99 |
Vested |  |  | (24,572 | ) |  | 39.89 |  |  | (24,819 | ) |  | 36.72 |  |  | (28,245 | ) |  | 22.82 |
Forfeited |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year |  |  | 15,745 |  | $ | 34.84 |  |  | 29,783 |  | $ | 34.18 |  |  | — |  | $ | — |
Compensation cost under the share and unit-based plans |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
Stock awards |  | $ | 749 |  | $ | 3,086 |  | $ | 6,964 |
Stock units |  |  | 7,526 |  |  | 8,048 |  |  | 3,291 |
LTIP units |  |  | 8,955 |  |  | 12,780 |  |  | 3,800 |
SARs |  |  | 626 |  |  | 2,318 |  |  | 2,669 |
Stock options |  |  | — |  |  | 402 |  |  | 596 |
Phantom stock units |  |  | 980 |  |  | 911 |  |  | 643 |
|  | $ | 18,836 |  | $ | 27,545 |  | $ | 17,963 |

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