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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summary of Stock Option Activity | A summary of the Company’s stock option and SARs activities and related information for the year ended December 31, 2017, is as follows:
|  | Number of options and SAR units (1) |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic- value |
Outstanding at the beginning of the year |  |  | 1,455,908 |  |  | $ | 19.76 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (711,208 | ) |  |  | 19.80 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (15,683 | ) |  |  | 17.51 |  |  |  |  |  |  |  |  |
Outstanding at the end of the year (2) |  |  | 729,017 |  |  | $ | 19.77 |  |  |  | 5.2 |  |  | $ | 19,229 |
Exercisable at the end of the year (3) |  |  | 513,464 |  |  | $ | 19.07 |  |  |  | 4.7 |  |  | $ | 13,906 |
| (1) | The SAR units are convertible for a maximum number of shares of the Company’s common stock equal to 75% of the SAR units subject to the grant.
| (2) | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 662,075 shares of the Company’s common stock issuable upon exercise.
| (3) | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 465,223 shares of the Company’s common stock issuable upon exercise.
Schedule of Options Granted, Classified into Range of Exercise Price | The options and SARs granted to employees of the Company and its subsidiaries and the options granted to non-employee directors of the Company which were outstanding as of December 31, 2017 have been classified into a range of exercise prices as follows:
|  | Outstanding |  |  | Exercisable |
Exercise price (range) |  | Number of options and SARs |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |  |  | Number of options and SARs |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |
14.16-18.62 |  |  | 365,793 |  |  |  | 4.2 |  |  | $ | 15.64 |  |  |  | 290,193 |  |  |  | 4.0 |  |  | $ | 15.80 |
19.36-24.86 |  |  | 204,724 |  |  |  | 5.9 |  |  | $ | 19.91 |  |  |  | 142,771 |  |  |  | 5.8 |  |  | $ | 19.65 |
27.17-31.51 |  |  | 158,500 |  |  |  | 6.9 |  |  | $ | 29.13 |  |  |  | 80,500 |  |  |  | 5.2 |  |  | $ | 29.81 |
|  |  | 729,017 |  |  |  | 5.2 |  |  | $ | 19.77 |  |  |  | 513,464 |  |  |  | 4.7 |  |  | $ | 19.07 |
Summary of Restricted Stock Units Activity | A summary of the Company’s RSU activities and related information for the year ended December 31, 2017, is as follows:
|  | Number of RSUs |  |  | Weighted average Grant-Date fair value |
Unvested as at the beginning of the year |  |  | 505,142 |  |  | $ | 21.59 |
Granted |  |  | 288,197 |  |  |  | 37.25 |
Vested |  |  | (203,016 | ) |  |  | 21.85 |
Forfeited |  |  | (29,707 | ) |  |  | 26.07 |
Unvested at the end of the year |  |  | 560,616 |  |  | $ | 29.31 |

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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://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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 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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