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Equity Incentive Awards (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of our restricted stock activities and related information is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Balance at December 31, 2015 | 85,500 |  |  | $49.72
Shares granted | 133,717 |  |  | $68.21
Shares vested | (153,610 | ) |  | $59.85
Balance at December 31, 2016 | 65,607 |  |  | $63.68
Shares granted | 130,426 |  |  | $76.25
Shares forfeited | (990 | ) |  | $80.54
Shares vested | (125,271 | ) |  | $68.79
Balance at December 31, 2017 | 69,772 |  |  | $77.77
Shares granted | 192,505 |  |  | $86.01
Shares vested | (112,426 | ) |  | $81.48
Balance at December 31, 2018 | 149,851 |  |  | $85.56
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of stock options granted was estimated on the grant date using the Black-Scholes-Merton model. The following table includes the assumptions made in the valuation:
| 2018 |  | 2017 |  | 2016
Dividend Yield | 2.5% |  | 2.4% |  | 2.3%
Risk-free interest rate | 2.8% |  | 1.9% |  | 1.3%
Expected Life | 5.6 years |  | 5.5 years |  | 6 years
Expected Volatility | 16.7% |  | 17.8% |  | 19.8%
Weighted Average Grant Date Fair Value Per Share | $12.95 |  | $11.00 |  | $10.70
Summary of Stock Option Activity | No options were forfeited or expired during the years ended December 31, 2018, 2017 and 2016. A summary of our stock option activity and related information is as follows:
| Shares Subject To Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Outstanding Contractual Life (in years) |  | Average Intrinsic Value (in millions)
Balance at December 31, 2015 | 865,600 |  |  | $23.12 |  | 1.5 |  | $37.7
Options issued | 7,550 |  |  | $74.53 |  |  |  |
Options exercised | (440,000 | ) |  | $25.66 |  |  |  | $18.7
Balance at December 31, 2016 | 433,150 |  |  | $21.44 |  | 1.7 |  | $22.0
Options issued | 6,930 |  |  | $81.15 |  |  |  |
Options exercised | (220,000 | ) |  | $22.05 |  |  |  | $14.5
Balance at December 31, 2017 | 220,080 |  |  | $22.72 |  | 1.6 |  | $14.6
Options issued | 6,270 |  |  | $89.65 |  |  |  |
Options exercised | (202,800 | ) |  | $18.85 |  |  |  | $16.9
Balance at December 31, 2018 | 23,550 |  |  | $73.89 |  | 7.3 |  | $0.5
Exercisable at December 31, 2018 | 17,084 |  |  | $68.94 |  | 6.7 |  | $0.5

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://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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- 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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