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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
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:
| 2019 |  | 2018 |  | 2017
Dividend yield | 5.5% |  | 6.5% |  | 5.3%
Expected volatility | 18.2% |  | 19.4% |  | 19.8%
Expected lives | 2.7 years |  | 2.9 years |  | 2.9 years
Risk-free interest rate | 2.39% |  | 2.39% |  | 1.49%
Schedule of Stock Option Activity [Table Text Block] | The following tables summarize our outstanding stock options, after giving effect to modifications of 83,334 options in November 2019 as, in substance, the forfeiture of old and issuance of new options concurrent with an employee’s retirement:
|  |  |  |  | Weighted Average |  |
| Number |  |  | Weighted Average |  | Remaining |  | Aggregate
| of Shares |  |  | Exercise Price |  | Contractual Life (Years) |  | Intrinsic Value
Outstanding December 31, 2016 | 541,679 |  |  | $65.84 |  |  |  |
Options granted under 2012 Plan | 495,000 |  |  | $74.90 |  |  |  |
Options granted under 2005 Plan | — |  |  | $0.00 |  |  |  |
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 granted under 2005 Plan | — |  |  | $0.00 |  |  |  |
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 |  |  |  |
Options granted under 2012 Plan | 685,334 |  |  | $79.08 |  |  |  |
Options exercised under 2012 Plan | (501,664 | ) |  | $71.52 |  |  |  |
Options forfeited under 2012 Plan | (100,002 | ) |  | $73.89 |  |  |  |
Options forfeited under 2005 Plan | — |  |  | $0.00 |  |  |  |
Options outstanding, December 31, 2019 | 1,004,014 |  |  | $74.35 |  | 3.24 |  | $ | 7,157,000 |
Exercisable at December 31, 2019 | 530,163 |  |  | $73.93 |  | 2.91 |  | $ | 4,001,000 |
|  |  |  |  |  | Remaining
Grant |  | Number |  |  | Exercise |  |  | Contractual
Date |  | of Shares |  |  | Price |  |  | Life in Years
2/20/2015 |  | 20,000 |  |  | $ | 72.11 |  |  | 0.14
2/22/2016 |  | 20,000 |  |  | $ | 60.52 |  |  | 1.15
2/22/2017 |  | 121,669 |  |  | $ | 74.78 |  |  | 2.15
2/20/2018 |  | 246,177 |  |  | $ | 64.33 |  |  | 3.14
2/21/2019 |  | 512,834 |  |  | $ | 79.96 |  |  | 4.15
11/7/2019 |  | 83,334 |  |  | $ | 72.67 |  |  | 0.85
Options outstanding, December 31, 2019 |  | 1,004,014 |  |  |  |  |
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, 2018 | 443,354 |  |  | $4.87
Options granted under 2012 Plan | 685,334 |  |  | $6.11
Options vested under 2012 Plan | (554,835 | ) |  | $5.62
Non-vested options forfeited under 2012 Plan | (100,002 | ) |  | $5.56
Non-vested December 31, 2019 | 473,851 |  |  | $5.64

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