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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016, is as follows:
|  | Number of options and SAR units |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic- value |
Outstanding at the beginning of the year |  |  | 2,406,455 |  |  | $ | 18.15 |  |  |  |  |  |  |  |  |
Granted (1) |  |  | 104,000 |  |  |  | 28.42 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,012,151 | ) |  |  | 16.89 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (42,396 | ) |  |  | 17.93 |  |  |  |  |  |  |  |  |
Outstanding at the end of the year (2) |  |  | 1,455,908 |  |  | $ | 19.76 |  |  |  | 4.7 |  |  | $ | 20,077 |
Vested or expected to vest at the end of the year |  |  | 1,422,492 |  |  | $ | 19.78 |  |  |  | 4.7 |  |  | $ | 19,587 |
Exercisable at the end of the year (3) |  |  | 972,229 |  |  | $ | 19.88 |  |  |  | 3.9 |  |  | $ | 13,286 |
| (1) | In 2016, the Company granted 104,000 stock options only to non-employee directors of the Company. No SARs were granted during 2016.
| (2) | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 1,305,719 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 882,273 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, 2016 have been classified into a range of exercise prices as follows:
|  | Outstanding |  |  | Exercisable |
Exercise price (range) |  | Number of options |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |  |  | Number of options |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |
12.60-15.54 |  |  | 396,969 |  |  |  | 4.7 |  |  | $ | 14.63 |  |  |  | 237,614 |  |  |  | 4.1 |  |  | $ | 14.59 |
16.08-18.62 |  |  | 381,257 |  |  |  | 4.1 |  |  | $ | 16.72 |  |  |  | 292,617 |  |  |  | 4.1 |  |  | $ | 16.73 |
19.36-24.86 |  |  | 438,579 |  |  |  | 4.4 |  |  | $ | 21.65 |  |  |  | 306,895 |  |  |  | 3.4 |  |  | $ | 22.26 |
27.01-32.34 |  |  | 239,103 |  |  |  | 6.4 |  |  | $ | 29.67 |  |  |  | 135,103 |  |  |  | 3.9 |  |  | $ | 30.62 |
|  |  | 1,455,908 |  |  |  | 4.7 |  |  | $ | 19.76 |  |  |  | 972,229 |  |  |  | 3.9 |  |  | $ | 19.88 |
Summary of Restricted Stock Units Activity | A summary of the Company’s RSU activities and related information for the year ended December 31, 2016, is as follows:
|  | Number of RSUs |  |  | Weighted average Grant-Date fair value |
Unvested as at the beginning of the year |  |  | 234,000 |  |  | $ | 19.89 |
Granted |  |  | 394,417 |  |  |  | 22.05 |
Vested |  |  | (99,972 | ) |  |  | 19.73 |
Forfeited |  |  | (23,303 | ) |  |  | 20.16 |
Unvested at the end of the year |  |  | 505,142 |  |  | $ | 21.59 |
Expected to vest at the end of the year |  |  | 463,757 |  |  | $ | 21.58 |

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