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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Deferred Compensation Arrangements [Abstract] |
Schedule of Stock Option Valuation Assumptions [Table Text Block] | The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
| 2018 |  | 2017 |  | 2016
Dividend yield | 6.5% |  | 5.3% |  | 6.2%
Expected volatility | 19.4% |  | 19.8% |  | 19.1%
Expected lives | 2.9 years |  | 2.9 years |  | 2.9 years
Risk-free interest rate | 2.39% |  | 1.49% |  | 0.91%
Schedule of Stock Option Activity [Table Text Block] | The following tables summarize our outstanding stock options:
|  |  |  |  | Weighted Average |  |
| Number |  |  | Weighted Average |  | Remaining |  | Aggregate
| of Shares |  |  | Exercise Price |  | Contractual Life (Years) |  | Intrinsic Value
Outstanding December 31, 2015 | 741,676 |  |  | $60.43 |  |  |  |
Options granted under 2012 Plan | 470,000 |  |  | $60.78 |  |  |  |
Options exercised under 2005 Plan | (61,666 | ) |  | $52.36 |  |  |  |
Options exercised under 2012 Plan | (608,331 | ) |  | $65.18 |  |  |  |
Outstanding December 31, 2016 | 541,679 |  |  | $65.84 |  |  |  |
Options granted under 2012 Plan | 495,000 |  |  | $74.90 |  |  |  |
Options exercised under 2005 Plan | (15,000 | ) |  | $47.52 |  |  |  |
Options exercised under 2012 Plan | (155,829 | ) |  | $65.73 |  |  |  |
Options canceled under 2012 Plan | (6,668 | ) |  | $60.52 |  |  |  |
Outstanding December 31, 2017 | 859,182 |  |  | $70.11 |  |  |  |
Options granted under 2012 Plan | 560,000 |  |  | $64.33 |  |  |  |
Options exercised under 2005 Plan | (6,668 | ) |  | $72.11 |  |  |  |
Options exercised under 2012 Plan | (462,167 | ) |  | $65.03 |  |  |  |
Options canceled under 2012 Plan | (30,001 | ) |  | $66.73 |  |  |  |
Outstanding December 31, 2018 | 920,346 |  |  | $69.24 |  | 3.35 |  | $ | 5,798,000 |
Exercisable December 31, 2018 | 476,992 |  |  | $70.93 |  | 2.88 |  | $ | 2,204,000 |
|  |  |  |  |  | Remaining
Grant |  | Number |  |  | Exercise |  |  | Contractual
Date |  | of Shares |  |  | Price |  |  | Life in Years
2/25/2014 |  | 15,000 |  |  | $ | 61.31 |  |  | 0.15
2/20/2015 |  | 50,002 |  |  | $ | 72.11 |  |  | 1.14
2/22/2016 |  | 36,668 |  |  | $ | 60.52 |  |  | 2.15
3/8/2016 |  | 26,667 |  |  | $ | 63.63 |  |  | 2.19
2/22/2017 |  | 399,170 |  |  | $ | 74.78 |  |  | 3.15
9/1/2017 |  | 10,000 |  |  | $ | 80.55 |  |  | 3.68
2/20/2018 |  | 382,839 |  |  | $ | 64.33 |  |  | 4.14
Outstanding December 31, 2018 |  | 920,346 |  |  |  |  |
Schedule of Nonvested Share Activity [Table Text Block] | The following table summarizes our outstanding non-vested stock options:
| Number of Shares |  |  | Weighted Average Grant Date Fair Value
Non-vested December 31, 2017 | 400,019 |  |  | $5.10
Options granted under 2012 Plan | 560,000 |  |  | $4.49
Options vested under 2012 Plan | (494,996 | ) |  | $4.62
Options vested under 2005 Plan | (6,668 | ) |  | $4.91
Non-vested options canceled under 2012 Plan | (15,001 | ) |  | $4.99
Non-vested December 31, 2018 | 443,354 |  |  | $4.87

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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