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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activity | The following table summarizes the stock option activity during the year ended December 31, 2017 for all the grants under the Equity Compensation Plan (in thousands, except share and per share data):
|  | Options |  |  | Weighted Average Exercise Price |
Outstanding at January 1, 2017 |  |  | 3,500 |  |  | $ | 15.99 |
Granted |  |  | — |  |  |  | — |
Exercised |  |  | (2,250 | ) |  |  | 16.89 |
Forfeited/ Expired |  |  | (750 | ) |  |  | 17.24 |
Cancelled |  |  | — |  |  |  | — |
Outstanding at December 31, 2017 |  |  | 500 |  |  |  | 10.04 |
Vested and expected to vest |  |  | 500 |  |  |  | 10.04 |
Exercisable at December 31, 2017 |  |  | 500 |  |  | $ | 10.04 |
Summary of Stock Options Outstanding and Exercisable By Price Range | A summary of stock options outstanding and exercisable by price range at December 31, 2017 is as follows (in thousands, except share and per share data):
|  | Outstanding and Exercisable |
Exercise Price |  | Number of Options Outstanding at December 31, 2017 |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value (A) |
$10.04-$15.06 |  |  | 500 |  |  |  | 1.5 |  |  | $ | 10.04 |  |  | $ | 81 |
(A) | The difference between the stock option’s exercise price and the closing price of common stock at December 31, 2017.
Restricted Stock and Units Activity | The following table summarizes the activity related to restricted stock unit (“RSU”) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2017 |  |  | 131,119 |  |  | $ | 45.44 |
Granted |  |  | 69,497 |  |  |  | 116.58 |
Vested |  |  | (84,407 | ) |  |  | 46.38 |
Forfeited |  |  | (5,526 | ) |  |  | 54.99 |
Unvested, December 31, 2017 |  |  | 110,683 |  |  | $ | 88.91 |
The following table summarizes the activity related to restricted stock award (“RSA”) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2017 |  |  | 749,955 |  |  | $ | 46.64 |
Granted |  |  | 3,604 |  |  |  | 83.25 |
Vested |  |  | (173,022 | ) |  |  | 47.14 |
Forfeited/ Canceled |  |  | (600 | ) |  |  | 49.70 |
Unvested, December 31, 2017 |  |  | 579,937 |  |  | $ | 46.72 |
Schedule of Nonvested Performance-Based Units Activity | The following table summarizes the activity related to performance unit awards (“PSU”) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2017 |  |  | 93,769 |  |  | $ | 46.02 |
Granted |  |  | 24,664 |  |  |  | 105.65 |
Vested |  |  | (45,118 | ) |  |  | 39.72 |
Forfeited |  |  | — |  |  |  | — |
Unvested, December 31, 2017 |  |  | 73,315 |  |  | $ | 62.36 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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