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SHAREHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Weighted-Average Assumptions Used To Estimate the Fair Value of Options Granted | The following table presents the weighted-average assumptions used to estimate the fair value of options granted in 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
Expected annual dividend yield | 2.4 | % |  | — | % |  | — | %
Risk-free interest rate | 2.26 | % |  | 1.64 | % |  | 1.73 | %
Expected volatility | 48.9 | % |  | 44.4 | % |  | 40.2 | %
Expected life in years | 4.00 |  |  | 7.10 |  |  | 6.30 |
Schedule of Outstanding and Exercisable Options | The following table summarizes information concerning outstanding and exercisable options:
| Weighted Average
| 2017 |  | 2016 |  | 2015
| Shares |  | Weighted Avg. Exercise Price |  | Shares |  | Weighted Avg. Exercise Price |  | Shares |  | Weighted Avg. Exercise Price
Outstanding at beginning of year | 1,410,250 |  |  | $ | 12.57 |  |  | 954,625 |  |  | $ | 15.98 |  |  | 1,127,250 |  |  | $ | 16.12 |
Granted | 10,000 |  |  | $ | 24.36 |  |  | 670,000 |  |  | $ | 8.43 |  |  | 25,000 |  |  | $ | 10.62 |
Exercised | (138,450 | ) |  | $ | 13.49 |  |  | — |  |  | $ | — |  |  | (4,000 | ) |  | $ | 6.30 |
Cancelled or expired | (280,500 | ) |  | $ | 16.04 |  |  | (214,375 | ) |  | $ | 14.86 |  |  | (193,625 | ) |  | $ | 16.29 |
Outstanding at end of year | 1,001,300 |  |  | $ | 11.58 |  |  | 1,410,250 |  |  | $ | 12.57 |  |  | 954,625 |  |  | $ | 15.98 |
Options exercisable at year end | 588,802 |  |  |  |  |  | 750,250 |  |  |  |  |  | 832,125 |  |  |  |
Weighted average fair value per option granted during the year | $ | 10.69 |  |  |  |  |  | $ | 3.94 |  |  |  |  |  | $ | 4.44 |  |  |  |
Schedule of Options Vested and Exercisable or Nonvested, Expected to Vest (Nonvested Outstanding Less Expected Forfeitures) | The following table summarizes information about options vested and exercisable or nonvested that are expected to vest (nonvested outstanding less expected forfeitures) at December 31, 2017:
Range of Exercise Prices |  | Number Exercisable |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value (in millions)
$ | 5.00 |  | to | $ | 10.00 |  |  | 505,738 |  |  | $ | 8.53 |  |  | 8.34 |  | $ | 12.5 |
$ | 10.01 |  | to | $ | 15.00 |  |  | 306,375 |  |  | $ | 13.00 |  |  | 2.63 |  | 6.2 |
$ | 15.01 |  | to | $ | 20.00 |  |  | 156,600 |  |  | $ | 18.32 |  |  | 4.47 |  | 2.3 |
$ | 20.01 |  | to | $ | 24.36 |  |  | 10,000 |  |  | $ | 24.36 |  |  | 9.61 |  | 0.1 |
$ | 5.00 |  | to | $ | 24.36 |  |  | 978,713 |  |  | $ | 11.66 |  |  | 5.94 |  | $ | 21.1 |
Schedule of Unvested Stock Options | The following table reflects the activity for all unvested stock options during 2017:
| Shares |  | Weighted Average Grant- Date Fair Value
Unvested at January 1, 2017 | 660,000 |  |  | $ | 4.02 |
Granted | 10,000 |  |  | $ | 10.69 |
Vested | (176,252 | ) |  | $ | 4.84 |
Forfeited | (81,250 | ) |  | $ | 3.21 |
Unvested at December 31, 2017 | 412,498 |  |  | $ | 4.93 |

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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 Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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