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Share and Unit-Based Plans: (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015, 2014 and 2013:
| 2015 |  | 2014 |  | 2013
| 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 | 9,189 |  |  | $ | 59.25 |  |  | 19,001 |  |  | $ | 56.77 |  |  | 20,924 |  |  | $ | 49.36 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | 8,963 |  |  | 61.84 |
Vested | (7,577 | ) |  | 58.67 |  |  | (9,812 | ) |  | 54.45 |  |  | (10,886 | ) |  | 46.70 |
Balance at end of year | 1,612 |  |  | $ | 62.01 |  |  | 9,189 |  |  | $ | 59.25 |  |  | 19,001 |  |  | $ | 56.77 |
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, 2015, 2014 and 2013:
| 2015 |  | 2014 |  | 2013
| 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 | 144,374 |  |  | $ | 59.94 |  |  | 137,318 |  |  | $ | 57.24 |  |  | 114,677 |  |  | $ | 52.19 |
Granted | 77,282 |  |  | 86.53 |  |  | 75,309 |  |  | 60.50 |  |  | 67,920 |  |  | 62.01 |
Vested | (86,761 | ) |  | 61.29 |  |  | (68,253 | ) |  | 55.14 |  |  | (45,279 | ) |  | 51.59 |
Forfeited | (2,809 | ) |  | 86.72 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year | 132,086 |  |  | $ | 74.58 |  |  | 144,374 |  |  | $ | 59.94 |  |  | 137,318 |  |  | $ | 57.24 |
Summary of activity of SARs awards | The following table summarizes the activity of SARs awards during the years ended December 31, 2015, 2014 and 2013:
| 2015 |  | 2014 |  | 2013
| Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price
Balance at beginning of year | 772,639 |  |  | $ | 56.67 |  |  | 1,070,991 |  |  | $ | 56.66 |  |  | 1,164,185 |  |  | $ | 56.66 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised | (364,807 | ) |  | 56.86 |  |  | (298,352 | ) |  | 56.63 |  |  | (93,194 | ) |  | 56.63 |
Special dividend adjustment | 9,951 |  |  | 55.13 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year | 417,783 |  |  | $ | 55.13 |  |  | 772,639 |  |  | $ | 56.67 |  |  | 1,070,991 |  |  | $ | 56.66 |
Summary of activity of non-vested LTIP Units | The following table summarizes the activity of the non-vested LTIP Units during the years ended December 31, 2015, 2014 and 2013:
| 2015 |  | 2014 |  | 2013
| 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 | 46,695 |  |  | $ | 58.89 |  |  | — |  |  | $ | — |  |  | 200,000 |  |  | $ | 38.63 |
Granted | 424,442 |  |  | 74.71 |  |  | 725,908 |  |  | 51.71 |  |  | 332,189 |  |  | 66.58 |
Vested | (414,822 | ) |  | 73.13 |  |  | (679,213 | ) |  | 51.22 |  |  | (518,900 | ) |  | 55.81 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | (13,289 | ) |  | 66.58 |
Balance at end of year | 56,315 |  |  | $ | 73.24 |  |  | 46,695 |  |  | $ | 58.89 |  |  | — |  |  | $ | — |
Summary of activity of stock options | The following table summarizes the activity of stock options for the years ended December 31, 2015, 2014 and 2013:
| 2015 |  | 2014 |  | 2013
| Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price
Balance at beginning of year | 10,068 |  |  | $ | 59.57 |  |  | 10,068 |  |  | $ | 59.57 |  |  | 12,768 |  |  | $ | 54.69 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised | — |  |  | — |  |  | — |  |  | — |  |  | (2,700 | ) |  | 36.51 |
Special dividend adjustment | 246 |  |  | 58.15 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year | 10,314 |  |  | $ | 58.15 |  |  | 10,068 |  |  | $ | 59.57 |  |  | 10,068 |  |  | $ | 59.57 |
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, 2015, 2014 and 2013:
| 2015 |  | 2014 |  | 2013
| Stock Units |  | Weighted Average Grant Date Fair Value |  | Stock Units |  | Weighted Average Grant Date Fair Value |  | Stock Units |  | Weighted Average Grant Date Fair Value
Balance at beginning of year | 9,269 |  |  | $ | 58.35 |  |  | 17,575 |  |  | $ | 58.66 |  |  | — |  |  | $ | — |
Granted | 13,351 |  |  | 78.72 |  |  | 10,747 |  |  | 65.54 |  |  | 34,266 |  |  | 59.04 |
Vested | (20,162 | ) |  | 72.17 |  |  | (19,053 | ) |  | 62.69 |  |  | (16,691 | ) |  | 59.44 |
Forfeited | (2,458 | ) |  | 55.62 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year | — |  |  | $ | — |  |  | 9,269 |  |  | $ | 58.35 |  |  | 17,575 |  |  | $ | 58.66 |
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, 2015, 2014 and 2013:
| 2015 |  | 2014 |  | 2013
Stock awards | $ | 252 |  |  | $ | 365 |  |  | $ | 497 |
Stock units | 6,041 |  |  | 4,689 |  |  | 3,839 |
LTIP units | 26,622 |  |  | 28,598 |  |  | 22,778 |
Stock options | 16 |  |  | 16 |  |  | 16 |
Phantom stock units | 1,444 |  |  | 1,205 |  |  | 992 |
| $ | 34,375 |  |  | $ | 34,873 |  |  | $ | 28,122 |

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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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