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Share and Unit-based Plans: (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
Share and Unit-based Plans: |
Summary of activity of non-vested stock awards |
|  | 2012 |  | 2011 |  | 2010 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | 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 |  |  | 21,130 |  | $ | 40.68 |  |  | 63,351 |  | $ | 53.69 |  |  | 126,137 |  | $ | 69.53 |
Granted |  |  | 9,639 |  |  | 54.43 |  |  | 11,350 |  |  | 48.47 |  |  | 11,664 |  |  | 38.58 |
Vested |  |  | (9,845 | ) |  | 35.69 |  |  | (53,571 | ) |  | 57.36 |  |  | (74,143 | ) |  | 78.48 |
Forfeited |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (307 | ) |  | 61.17 |
Balance at end of year |  |  | 20,924 |  | $ | 49.36 |  |  | 21,130 |  | $ | 40.68 |  |  | 63,351 |  | $ | 53.69 |
Summary of activity of non-vested stock units |
|  | 2012 |  | 2011 |  | 2010 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | 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 |  |  | 576,340 |  | $ | 11.71 |  |  | 1,038,549 |  | $ | 7.17 |  |  | 1,567,597 |  | $ | 7.17 |
Granted |  |  | 72,322 |  |  | 54.43 |  |  | 64,463 |  |  | 48.36 |  |  | — |  |  | — |
Vested |  |  | (533,985 | ) |  | 8.80 |  |  | (519,272 | ) |  | 7.17 |  |  | (529,048 | ) |  | 7.17 |
Forfeited |  |  | — |  |  | — |  |  | (7,400 | ) |  | 12.35 |  |  | — |  |  | — |
Balance at end of year |  |  | 114,677 |  | $ | 52.19 |  |  | 576,340 |  | $ | 11.71 |  |  | 1,038,549 |  | $ | 7.17 |
Summary of activity of SARs awards |
|  | 2012 |  | 2011 |  | 2010 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price |
Balance at beginning of year |  |  | 1,156,985 |  | $ | 56.55 |  |  | 1,242,314 |  | $ | 56.56 |  |  | 1,324,700 |  | $ | 56.56 |
Granted |  |  | 39,932 |  |  | 59.57 |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised |  |  | (32,732 | ) |  | 56.63 |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited |  |  | — |  |  | — |  |  | (85,329 | ) |  | 56.63 |  |  | (82,386 | ) |  | 56.63 |
Balance at end of year |  |  | 1,164,185 |  | $ | 56.65 |  |  | 1,156,985 |  | $ | 56.55 |  |  | 1,242,314 |  | $ | 56.56 |
Summary of activity of non-vested LTIP Units |
|  | 2012 |  | 2011 |  | 2010 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | 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 |  |  | 190,000 |  | $ | 43.30 |  |  | 272,226 |  | $ | 50.68 |  |  | 252,940 |  | $ | 55.50 |
Granted |  |  | 315,000 |  |  | 40.53 |  |  | 422,631 |  |  | 46.48 |  |  | 232,632 |  |  | 48.89 |
Vested |  |  | (305,000 | ) |  | 44.85 |  |  | (504,857 | ) |  | 49.85 |  |  | (213,346 | ) |  | 54.45 |
Forfeited |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year |  |  | 200,000 |  | $ | 38.63 |  |  | 190,000 |  | $ | 43.30 |  |  | 272,226 |  | $ | 50.68 |
Summary of activity of stock options |
|  | 2012 |  | 2011 |  | 2010 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |
Balance at beginning of year |  |  | 2,700 |  | $ | 36.51 |  |  | 110,711 |  | $ | 75.08 |  |  | 110,711 |  | $ | 75.08 |
Granted |  |  | 10,068 |  |  | 59.57 |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited |  |  | — |  |  | — |  |  | (108,011 | ) |  | 76.05 |  |  | — |  |  | — |
Balance at end of year |  |  | 12,768 |  | $ | 54.69 |  |  | 2,700 |  | $ | 36.51 |  |  | 110,711 |  | $ | 75.08 |
Summary of activity of non-vested phantom stock units |
|  | 2012 |  | 2011 |  | 2010 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | 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 |  |  | 15,745 |  | $ | 34.84 |  |  | 29,783 |  | $ | 34.18 |  |  | — |  | $ | — |
Granted |  |  | 7,896 |  |  | 57.29 |  |  | 10,534 |  |  | 48.51 |  |  | 54,602 |  |  | 35.33 |
Vested |  |  | (22,179 | ) |  | 45.24 |  |  | (24,572 | ) |  | 39.89 |  |  | (24,819 | ) |  | 36.72 |
Forfeited |  |  | (1,462 | ) |  | 33.74 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year |  |  | — |  | $ | — |  |  | 15,745 |  | $ | 34.84 |  |  | 29,783 |  | $ | 34.18 |
Compensation cost under the share and unit-based plans |
|  | 2012 |  | 2011 |  | 2010 |
--- | --- | --- | --- | --- | --- | --- | ---
Stock awards |  | $ | 598 |  | $ | 749 |  | $ | 3,086 |
Stock units |  |  | 3,379 |  |  | 7,526 |  |  | 8,048 |
LTIP units |  |  | 9,436 |  |  | 8,955 |  |  | 12,780 |
SARs |  |  | 583 |  |  | 626 |  |  | 2,318 |
Stock options |  |  | 21 |  |  | — |  |  | 402 |
Phantom stock units |  |  | 953 |  |  | 980 |  |  | 911 |
|  | $ | 14,970 |  | $ | 18,836 |  | $ | 27,545 |

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