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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Deferred Compensation Arrangements [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of each grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
| 2018 |  | 2017
Dividend yield | 6.5% |  | 5.3%
Expected volatility | 19.4% |  | 19.8%
Expected lives | 2.9 years |  | 2.9 years
Risk-free interest rate | 2.39% |  | 1.49%
Schedule of Stock Option Activity | The following table summarizes our outstanding stock options:
| Six Months Ended
| June 30,
| 2018 |  | 2017
Options outstanding January 1, | 859,182 |  |  | 541,679 |
Options granted under 2012 Plan | 560,000 |  |  | 485,000 |
Options exercised under 2012 Plan | (94,170 | ) |  | (70,830 | )
Options forfeited under 2012 Plan | (15,000 | ) |  | (6,668 | )
Options exercised under 2005 Plan | — |  |  | (15,000 | )
Options outstanding, June 30, | 1,310,012 |  |  | 934,181 |
Exercisable at June 30, | 854,990 |  |  | 540,830 |

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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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