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Equity Incentive Awards (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | A summary of our restricted stock activity, and related information for the years ended December 31, 2017, 2016, and 2015 follows:
| Number of Shares | Weighted Average Grant Date Fair Value
Balance at December 31, 2014 | 102,225 |  | 41.09 |
Shares granted | 158,014 |  | 54.68 |
Shares vested | (174,739 | ) | 49.17 |
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 |
Summary of Stock Option Activity | Note 14—Equity Incentive Awards (continued) A summary of our stock option activity, and related information for the years ended December 31, 2017, 2016 and 2015 follows:
|  | Shares Subject To Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Outstanding Contractual Life (in years)
Balance at December 31, 2014 |  | 1,085,600 |  |  | $ | 21.95 |  |  | 2.1
Options exercised |  | (220,000 | ) |  | 17.35 |  |  |
Balance at December 31, 2015 |  | 865,600 |  |  | 23.12 |  |  | 1.6
Options issued |  | 7,550 |  |  | 10.70 |  |  |
Options exercised |  | (440,000 | ) |  | 25.66 |  |  |
Balance at December 31, 2016 |  | 433,150 |  |  | 21.44 |  |  | 1.7
Options issued |  | 6,930 |  |  | 11.00 |  |  |
Options exercised |  | (220,000 | ) |  | 22.05 |  |  |
Balance at December 31, 2017 |  | 220,080 |  |  | 18.32 |  |  | 1.5
Exercisable at December 31, 2017 |  | 212,966 |  |  | 20.84 |  |  | 1.4
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of each grant is estimated on the grant date using the Black-Scholes-Merton model. The following table includes the assumptions that were made and the estimated fair values:
|  | 2017
Dividend Yield |  | 2.4 | %
Risk-free interest rate |  | 1.9 | %
Expected Life |  | 5.5 years |
Expected Volatility |  | 17.8 | %
Estimated Grant Date Fair Value of Options |  | $ | 76,230 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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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