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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of weighted average assumptions used to estimate the grant date fair value of options granted | The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the six months ended June 30, 2018 and the year ended December 31, 2017.
| June 30, 2018 |  | December 31, 2017
Dividend yield | 2.85 | % |  | 2.51 | %
Expected life | 3.5 years |  |  | 4.4 years |
Risk-free interest rate | 2.48 | % |  | 1.73 | %
Expected stock price volatility | 22.00 | % |  | 28.10 | %
Summary of the status of stock options and changes during the period | A summary of the status of the Company's stock options as of June 30, 2018 and December 31, 2017, and changes during the six months ended June 30, 2018 and year ended December 31, 2017 are as follows:
| June 30, 2018 |  | December 31, 2017
| Options Outstanding |  | Weighted Average Exercise Price |  | Options Outstanding |  | Weighted Average Exercise Price
Balance at beginning of period | 1,548,719 |  |  | $ | 101.48 |  |  | 1,737,213 |  |  | $ | 98.44 |
Granted | 6,000 |  |  | 97.91 |  |  | 174,000 |  |  | 105.66 |
Exercised | (58,734 | ) |  | 89.62 |  |  | (292,193 | ) |  | 81.07 |
Lapsed or canceled | (56,033 | ) |  | 114.70 |  |  | (70,301 | ) |  | 121.68 |
Balance at end of period | 1,439,952 |  |  | $ | 101.43 |  |  | 1,548,719 |  |  | $ | 101.48 |
Options exercisable at end of period | 1,067,969 |  |  | $ | 98.93 |  |  | 800,902 |  |  | $ | 94.33 |
Total fair value of options granted during the period | $ | 84,068 |  |  |  |  |  | $ | 3,816,652 |  |  |  |
Summary of restricted stock and charges during the period | A summary of the Company's restricted stock as of June 30, 2018 and December 31, 2017 and charges during the six months ended June 30, 2018 and the year ended December 31, 2017, are as follows:
| June 30, 2018 |  | December 31, 2017
Balance at beginning of period | 3,298,216 |  |  | 3,202,031 |
Granted | 1,700 |  |  | 96,185 |
Canceled | (8,300 | ) |  | — |
Balance at end of period | 3,291,616 |  |  | 3,298,216 |
Vested during the period | 92,114 |  |  | 95,736 |
Compensation expense recorded | $ | 6,251,350 |  |  | $ | 9,809,749 |
Total fair value of restricted stock granted during the period | $ | 163,831 |  |  | $ | 9,905,986 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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