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Share and Unit-Based Plans: (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of activity of non-vested stock awards | The following table summarizes the activity of non-vested stock awards during the years ended December 31, 2013, 2012 and 2011:
| 2013 |  | 2012 |  | 2011
| 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 | 20,924 |  |  | $ | 49.36 |  |  | 21,130 |  |  | $ | 40.68 |  |  | 63,351 |  |  | $ | 53.69 |
Granted | 8,963 |  |  | 61.84 |  |  | 9,639 |  |  | 54.43 |  |  | 11,350 |  |  | 48.47 |
Vested | (10,886 | ) |  | 46.70 |  |  | (9,845 | ) |  | 35.69 |  |  | (53,571 | ) |  | 57.36 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year | 19,001 |  |  | $ | 56.77 |  |  | 20,924 |  |  | $ | 49.36 |  |  | 21,130 |  |  | $ | 40.68 |
Summary of activity of non-vested stock units | The following table summarizes the activity of non-vested stock units during the years ended December 31, 2013, 2012 and 2011:
| 2013 |  | 2012 |  | 2011
| 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 | 114,677 |  |  | $ | 52.19 |  |  | 576,340 |  |  | $ | 11.71 |  |  | 1,038,549 |  |  | $ | 7.17 |
Granted | 67,920 |  |  | 62.01 |  |  | 72,322 |  |  | 54.43 |  |  | 64,463 |  |  | 48.36 |
Vested | (45,279 | ) |  | 51.59 |  |  | (533,985 | ) |  | 8.80 |  |  | (519,272 | ) |  | 7.17 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | (7,400 | ) |  | 12.35 |
Balance at end of year | 137,318 |  |  | $ | 57.24 |  |  | 114,677 |  |  | $ | 52.19 |  |  | 576,340 |  |  | $ | 11.71 |
Summary of activity of SARs awards | The following table summarizes the activity of SARs awards during the years ended December 31, 2013, 2012 and 2011:
| 2013 |  | 2012 |  | 2011
| Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price
Balance at beginning of year | 1,164,185 |  |  | $ | 56.66 |  |  | 1,156,985 |  |  | $ | 56.55 |  |  | 1,242,314 |  |  | $ | 56.56 |
Granted | — |  |  | — |  |  | 39,932 |  |  | 59.57 |  |  | — |  |  | — |
Exercised | (93,194 | ) |  | 56.63 |  |  | (32,732 | ) |  | 56.63 |  |  | — |  |  | — |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | (85,329 | ) |  | 56.63 |
Balance at end of year | 1,070,991 |  |  | $ | 56.66 |  |  | 1,164,185 |  |  | $ | 56.66 |  |  | 1,156,985 |  |  | $ | 56.55 |
Summary of activity of non-vested LTIP Units | The following table summarizes the activity of non-vested LTIP Units during the years ended December 31, 2013, 2012 and 2011:
| 2013 |  | 2012 |  | 2011
| 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 | 200,000 |  |  | $ | 38.63 |  |  | 190,000 |  |  | $ | 43.30 |  |  | 272,226 |  |  | $ | 50.68 |
Granted | 332,189 |  |  | 66.58 |  |  | 315,000 |  |  | 40.53 |  |  | 422,631 |  |  | 46.48 |
Vested | (518,900 | ) |  | 55.81 |  |  | (305,000 | ) |  | 44.85 |  |  | (504,857 | ) |  | 49.85 |
Forfeited | (13,289 | ) |  | 66.58 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year | — |  |  | $ | — |  |  | 200,000 |  |  | $ | 38.63 |  |  | 190,000 |  |  | $ | 43.30 |
Summary of activity of stock options | The following table summarizes the activity of stock options for the years ended December 31, 2013, 2012 and 2011:
| 2013 |  | 2012 |  | 2011
| Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price
Balance at beginning of year | 12,768 |  |  | $ | 54.69 |  |  | 2,700 |  |  | $ | 36.51 |  |  | 110,711 |  |  | $ | 75.08 |
Granted | — |  |  | — |  |  | 10,068 |  |  | 59.57 |  |  | — |  |  | — |
Exercised | (2,700 | ) |  | 36.51 |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | (108,011 | ) |  | 76.05 |
Balance at end of year | 10,068 |  |  | $ | 59.57 |  |  | 12,768 |  |  | $ | 54.69 |  |  | 2,700 |  |  | $ | 36.51 |
Summary of activity of non-vested phantom stock units | The following table summarizes the activity of the non-vested phantom stock units for the years ended December 31, 2013, 2012 and 2011:
| 2013 |  | 2012 |  | 2011
| 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 | 34,266 |  |  | 59.04 |  |  | 7,896 |  |  | 57.29 |  |  | 10,534 |  |  | 48.51 |
Vested | (16,691 | ) |  | 59.44 |  |  | (22,179 | ) |  | 45.24 |  |  | (24,572 | ) |  | 39.89 |
Forfeited | — |  |  | — |  |  | (1,462 | ) |  | 33.74 |  |  | — |  |  | — |
Balance at end of year | 17,575 |  |  | $ | 58.66 |  |  | — |  |  | $ | — |  |  | 15,745 |  |  | $ | 34.84 |
Compensation cost under the share and unit-based plans | The following summarizes the compensation cost under the share and unit-based plans for the years ended December 31, 2013, 2012 and 2011:
| 2013 |  | 2012 |  | 2011
Stock awards | $ | 497 |  |  | $ | 598 |  |  | $ | 749 |
Stock units | 3,839 |  |  | 3,379 |  |  | 7,526 |
LTIP units | 22,778 |  |  | 9,436 |  |  | 8,955 |
SARs | — |  |  | 583 |  |  | 626 |
Stock options | 16 |  |  | 21 |  |  | — |
Phantom stock units | 992 |  |  | 953 |  |  | 980 |
| $ | 28,122 |  |  | $ | 14,970 |  |  | $ | 18,836 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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