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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation [Abstract] |
Schedule of stock option plans activity | Additional information relating to the Company’s stock option plans follows:
| 2018 |  | 2017 |  | 2016
Options outstanding at beginning of year | 63 |  |  | 91 |  |  | 169 |
Options exercised | — |  |  | (28 | ) |  | (78 | )
Options forfeited and expired | — |  |  | — |  |  | — |
Options outstanding at end of year | 63 |  |  | 63 |  |  | 91 |
Options exercisable at end of year | 63 |  |  | 63 |  |  | 90 |
Option prices per share: |  |  |  |  |
Options exercised during the year | $ | — |  |  | 57.34-66.14 |  |  | 28.37-93.65 |
Options forfeited and expired during the year | $ | — |  |  | — |  |  | — |
Options outstanding at end of year | 57.34-66.14 |  |  | 57.34-66.14 |  |  | 57.34-66.14 |
Options exercisable at end of year | 57.34-66.14 |  |  | 57.34-66.14 |  |  | 57.34-66.14 |
Summary of the stock options under the 2002, 2007 and 2012 plans | A summary of the Company’s options under it’s long-term incentive plans as of December 31, 2018, and changes during the year then ended is presented as follows:
| Shares |  | Weighted average exercise price |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value
Options outstanding, December 31, 2017 | 63 |  |  | $ | 62.86 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited and expired | — |  |  | — |  |  |  |  |
Options outstanding, December 31, 2018 | 63 |  |  | $ | 62.86 |  |  | 2.8 |  | $ | 3,415 |
Vested and expected to vest as of December 31, 2018 | 63 |  |  | $ | 62.86 |  |  | 2.8 |  | $ | 3,415 |
Exercisable as of December 31, 2018 | 63 |  |  | $ | 62.86 |  |  | 2.8 |  | $ | 3,415 |
Summary of stock options outstanding | The following table summarizes information about the Company’s stock options outstanding as of December 31, 2018:
| Outstanding |  | Exercisable
Exercise price range | Number of shares |  | Average life |  | Average price |  | Number of shares |  | Average price
$57.34-$57.34 | 23 |  |  | 2.15 |  | 57.34 |  |  | 23 |  |  | 57.34 |
$66.14-$66.14 | 40 |  |  | 3.14 |  | 66.14 |  |  | 40 |  |  | 66.14 |
Total | 63 |  |  | 2.77 |  | $ | 62.86 |  |  | 63 |  |  | $ | 62.86 |
Summary of RSUs under the 2007 and 2012 plans | A summary of the Company’s RSUs under the Company’s long-term incentive plans as of December 31, 2018, and changes during the year then ended is presented as follows:
| Shares |  | Weighted average grant date fair value |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value
Restricted Stock Units outstanding, December 31, 2017 | 555 |  |  | $ | 147.28 |  |  |  |  |
Granted | 136 |  |  | 231.25 |  |  |  |  |
Released | (235 | ) |  | 156.56 |  |  |  |  |
Forfeited | (10 | ) |  | 211.16 |  |  |  |  |
Restricted Stock Units outstanding, December 31, 2018 | 446 |  |  | $ | 166.56 |  |  | 1.1 |  | $ | 51,501 |
Expected to vest as of December 31, 2018 | 440 |  |  |  |  | 1.1 |  | $ | 50,746 |
Additional information for RSUs under the 2007 and 2012 plans | Additional information relating to the Company’s RSUs under the Company’s long-term incentive plans are as follows:
| 2018 |  | 2017 |  | 2016
Restricted Stock Units outstanding, January 1 | 555 |  |  | 695 |  |  | 750 |
Granted | 136 |  |  | 154 |  |  | 187 |
Released | (235 | ) |  | (284 | ) |  | (226 | )
Forfeited | (10 | ) |  | (10 | ) |  | (16 | )
Restricted Stock Units outstanding, December 31 | 446 |  |  | 555 |  |  | 695 |
Expected to vest as of December 31 | 440 |  |  | 546 |  |  | 682 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&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://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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