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Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock Options |
Schedule of Black-Scholes-Merton option valuation model assumptions |
|  | 2017 (1) |  | 2016 |
Expected Life (Years) |  | — |  | 7.61 |
Dividend yield |  | — | % | 2.50 | %
Interest rate |  | — | % | 1.50 | %
Volatility |  | — | % | 41.32 | %
(1) No stock options were granted during the twelve months ended December 31, 2017. |  |  |
Summary of option activity under stock option plans |
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  | Weighted |  | average |  |  |  |
|  |  |  | average |  | remaining |  | Aggregate |
|  | Number of |  | exercise |  | contractual |  | intrinsic |
|  | options |  | price |  | term (years) |  | value ($) |
|  |  |  |  |  |  |  |  | (in Thousands) |
Options outstanding at December 31, 2016 |  | 800,502 |  | $ | 19.43 |  |  |  |  |  |
Plus: Options granted |  | — |  |  | — |  |  |  |  |  |
Less: |  |  |  |  |  |  |  |  |  |  |
Options exercised |  | 108,885 |  |  | 13.34 |  |  |  |  |  |
Options expired |  | 2,188 |  |  | 10.40 |  |  |  |  |  |
Options forfeited |  | 21,263 |  |  | 20.62 |  |  |  |  |  |
Options outstanding at December 31, 2017 |  | 668,166 |  |  | 20.41 |  | 5.54 |  | $ | 12,887 |
Options fully vested and exercisable at December 31, 2017 |  | 283,472 |  | $ | 18.62 |  | 4.46 |  | $ | 5,975 |
Schedule of other information pertaining to option activity |
|  | Twelve Months Ended December 31, |
|  | 2017(1) |  | 2016 |  | 2015 |
Weighted average grant date fair value of stock options granted |  | $ | — |  | $ | 8.74 |  | $ | 9.42 |
Total fair value of stock options vested |  | $ | 1,182,000 |  | $ | 1,015,000 |  | $ | 872,000 |
Total intrinsic value of stock options exercised |  | $ | 2,595,000 |  | $ | 792,000 |  | $ | 781,000 |
(1) No stock options were granted during the twelve months ended December 31, 2017. |

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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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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