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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015, 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 |  |  | 3,316,380 |  |  | $ | 16.50 |  |  |  |  |  |  |  |  |
Granted (1) |  |  | 200,500 |  |  |  | 20.18 |  |  |  |  |  |  |  |  |
Exercised |  |  | (905,116 | ) |  |  | 11.91 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (205,309 | ) |  |  | 20.99 |  |  |  |  |  |  |  |  |
Outstanding at the end of the year (2) |  |  | 2,406,455 |  |  | $ | 18.15 |  |  |  | 4.4 |  |  | $ | 13,942,939 |
Vested or expected to vest as of December 31 |  |  | 2,343,032 |  |  | $ | 18.18 |  |  |  | 4.4 |  |  | $ | 13,530,902 |
Exercisable as of December 31 (3) |  |  | 1,562,042 |  |  | $ | 18.83 |  |  |  | 3.5 |  |  | $ | 8,428,814 |
(1) | Includes 134,500 SAR units which 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 2,107,339 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 1,412,528 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 and its subsidiaries which were outstanding as of December 31, 2015 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 |
6.99-9.78 |  |  | 113,857 |  |  |  | 0.4 |  |  | $ | 8.29 |  |  |  | 113,857 |  |  |  | 0.4 |  |  | $ | 8.29 |
11.58-15.54 |  |  | 789,547 |  |  |  | 4.7 |  |  | $ | 14.74 |  |  |  | 461,108 |  |  |  | 3.7 |  |  | $ | 14.66 |
16.08-19.59 |  |  | 875,485 |  |  |  | 5.6 |  |  | $ | 17.30 |  |  |  | 421,553 |  |  |  | 5.3 |  |  | $ | 16.95 |
19.83-32.34 |  |  | 627,566 |  |  |  | 3.1 |  |  | $ | 25.40 |  |  |  | 565,524 |  |  |  | 2.8 |  |  | $ | 25.76 |
|  |  | 2,406,455 |  |  |  | 4.4 |  |  | $ | 18.15 |  |  |  | 1,562,042 |  |  |  | 3.5 |  |  | $ | 18.83 |
Summary of Restricted Stock Units Activity | A summary of the Company’s RSU activities and related information for the year ended December 31, 2015, is as follows:
|  | Number of RSUs |  |  | Weighted average Grant-Date fair value |
Unvested as at the beginning of the year |  |  | — |  |  | $ | — |
Granted |  |  | 245,000 |  |  |  | 19.89 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | (11,000 | ) |  |  | 19.83 |
Unvested at the end of the year |  |  | 234,000 |  |  | $ | 19.89 |
Expected to vest after December 31, 2015 |  |  | 217,200 |  |  | $ | 19.88 |

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