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Share and Unit-based Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
| 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 | — |  |  | $ | — |  |  | 1,612 |  |  | $ | 62.01 |  |  | 9,189 |  |  | $ | 59.25 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Vested | — |  |  | — |  |  | (1,612 | ) |  | 62.01 |  |  | (7,577 | ) |  | 58.67 |
Balance at end of year | — |  |  | $ | — |  |  | — |  |  | $ | — |  |  | 1,612 |  |  | $ | 62.01 |
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, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
| 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 | 148,428 |  |  | $ | 78.53 |  |  | 132,086 |  |  | $ | 74.58 |  |  | 144,374 |  |  | $ | 59.94 |
Granted | 86,827 |  |  | 66.46 |  |  | 85,601 |  |  | 79.22 |  |  | 77,282 |  |  | 86.53 |
Vested | (81,205 | ) |  | 75.62 |  |  | (69,259 | ) |  | 71.82 |  |  | (86,761 | ) |  | 61.29 |
Forfeited | (2,695 | ) |  | 69.57 |  |  | — |  |  | — |  |  | (2,809 | ) |  | 86.72 |
Balance at end of year | 151,355 |  |  | $ | 73.32 |  |  | 148,428 |  |  | $ | 78.53 |  |  | 132,086 |  |  | $ | 74.58 |
Summary of Activity of SARs Awards | The following table summarizes the activity of SARs awards during the years ended December 31, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
| Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price |  | Units |  | Weighted Average Exercise Price
Balance at beginning of year | 284,146 |  |  | $ | 53.85 |  |  | 417,783 |  |  | $ | 55.13 |  |  | 772,639 |  |  | $ | 56.67 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised | (48,707 | ) |  | 53.95 |  |  | (143,822 | ) |  | 53.73 |  |  | (364,807 | ) |  | 56.86 |
Special dividend adjustment | — |  |  | — |  |  | 10,185 |  |  | 53.88 |  |  | 9,951 |  |  | 55.13 |
Balance at end of year | 235,439 |  |  | $ | 53.83 |  |  | 284,146 |  |  | $ | 53.85 |  |  | 417,783 |  |  | $ | 55.13 |
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, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
| 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 | 322,572 |  |  | $ | 58.18 |  |  | 56,315 |  |  | $ | 73.24 |  |  | 46,695 |  |  | $ | 58.89 |
Granted | 506,906 |  |  | 55.33 |  |  | 480,371 |  |  | 65.00 |  |  | 424,442 |  |  | 74.71 |
Vested | (192,846 | ) |  | 69.93 |  |  | (214,114 | ) |  | 77.45 |  |  | (414,822 | ) |  | 73.13 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |
Balance at end of year | 636,632 |  |  | $ | 52.36 |  |  | 322,572 |  |  | $ | 58.18 |  |  | 56,315 |  |  | $ | 73.24 |
Summary of Activity of Stock Options | The following table summarizes the activity of stock options for the years ended December 31, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
| Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price
Balance at beginning of year | 10,565 |  |  | $ | 56.77 |  |  | 10,314 |  |  | $ | 58.15 |  |  | 10,068 |  |  | $ | 59.57 |
Granted | 25,000 |  |  | 57.55 |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Special dividend adjustment | — |  |  | — |  |  | 251 |  |  | 56.77 |  |  | 246 |  |  | 58.15 |
Balance at end of year | 35,565 |  |  | $ | 57.32 |  |  | 10,565 |  |  | $ | 56.77 |  |  | 10,314 |  |  | $ | 58.15 |
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, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
| 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 | 5,845 |  |  | $ | 81.47 |  |  | — |  |  | $ | — |  |  | 9,269 |  |  | $ | 58.35 |
Granted | 8,760 |  |  | 68.93 |  |  | 21,088 |  |  | 80.21 |  |  | 13,351 |  |  | 78.72 |
Vested | (10,551 | ) |  | 71.69 |  |  | (15,243 | ) |  | 79.73 |  |  | (20,162 | ) |  | 72.17 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | (2,458 | ) |  | 55.62 |
Balance at end of year | 4,054 |  |  | $ | 79.82 |  |  | 5,845 |  |  | $ | 81.47 |  |  | — |  |  | $ | — |
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, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
Stock awards | $ | — |  |  | $ | 20 |  |  | $ | 252 |
Stock units | 6,045 |  |  | 6,305 |  |  | 6,041 |
LTIP units | 30,161 |  |  | 32,957 |  |  | 26,622 |
Stock options | 85 |  |  | 16 |  |  | 16 |
Phantom stock units | 714 |  |  | 1,231 |  |  | 1,444 |
| $ | 37,005 |  |  | $ | 40,529 |  |  | $ | 34,375 |

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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=96867065&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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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