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EMPLOYEE BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of stock options and stock appreciation rights activity | The following table summarizes stock options and stock appreciation rights activity during the Second Quarter:
Stock Options and Stock Appreciation Rights |  | Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value
|  | (in Thousands) |  |  |  | (in Years) |  | (in Thousands)
Outstanding at March 31, 2018 |  | 2,077 |  |  | $ | 50.14 |  |  | 2.0 |  | $ | — |
Granted |  | — |  |  | — |  |  |  |  |
Exercised |  | (14 | ) |  | 13.65 |  |  |  |  | — |
Forfeited or expired |  | (60 | ) |  | 48.38 |  |  |  |  |
Outstanding at June 30, 2018 |  | 2,003 |  |  | 50.44 |  |  | 1.8 |  | 307 |
Exercisable at June 30, 2018 |  | 1,417 |  |  | $ | 55.82 |  |  | 1.8 |  | $ | 307 |
Summary of stock options and stock appreciation rights outstanding and exercisable | The following tables summarize information with respect to stock options and stock appreciation rights outstanding and exercisable at June 30, 2018:
Cash Stock Appreciation Rights Outstanding |  | Cash Stock Appreciation Rights Exercisable
Range of Exercise Prices |  | Number of Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Number of Shares |  | Weighted- Average Exercise Price
|  | (in Thousands) |  |  |  | (in Years) |  | (in Thousands) |  |
$29.78 - $47.99 |  | 61 |  |  | $ | 36.73 |  |  | 0.7 |  | 38 |  |  | $ | 36.73 |
Total |  | 61 |  |  | $ | 36.73 |  |  | 0.7 |  | 38 |  |  | $ | 36.73 |
Stock Options Outstanding |  | Stock Options Exercisable
Range of Exercise Prices |  | Number of Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Number of Shares |  | Weighted- Average Exercise Price
|  | (in Thousands) |  |  |  | (in Years) |  | (in Thousands) |  |
$13.65 - $29.49 |  | 22 |  |  | $ | 14.41 |  |  | 0.6 |  | 22 |  |  | $ | 14.41 |
$29.78 - $47.99 |  | 43 |  |  | 38.40 |  |  | 1.5 |  | 43 |  |  | 38.40 |
$55.04 - $83.83 |  | 87 |  |  | 81.35 |  |  | 2.4 |  | 87 |  |  | 81.35 |
$95.91 - $131.46 |  | 123 |  |  | 127.98 |  |  | 3.2 |  | 123 |  |  | 127.98 |
Total |  | 275 |  |  | $ | 90.16 |  |  | 2.5 |  | 275 |  |  | $ | 90.16 |
Stock Appreciation Rights Outstanding |  | Stock Appreciation Rights Exercisable
Range of Exercise Prices |  | Number of Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Number of Shares |  | Weighted- Average Exercise Price
|  | (in Thousands) |  |  |  | (in Years) |  | (in Thousands) |  |
$13.65 - $29.49 |  | 48 |  |  | $ | 29.49 |  |  | 6.1 |  | 16 |  |  | $ | 29.49 |
$29.78 - $47.99 |  | 1,423 |  |  | 37.93 |  |  | 1.3 |  | 895 |  |  | 38.00 |
$55.04 - $83.83 |  | 110 |  |  | 79.03 |  |  | 4.0 |  | 107 |  |  | 79.55 |
$95.91 - $131.46 |  | 86 |  |  | 115.60 |  |  | 2.6 |  | 86 |  |  | 115.60 |
Total |  | 1,667 |  |  | $ | 44.40 |  |  | 1.7 |  | 1,104 |  |  | $ | 47.94 |
Summary of restricted stock, restricted stock units and performance restricted stock units activity | The following table summarizes restricted stock unit and performance restricted stock unit activity during the Second Quarter:
Restricted Stock Units and Performance Restricted Stock Units |  | Number of Shares |  | Weighted-Average Grant Date Fair Value Per Share
|  | (in Thousands) |  |
Nonvested at March 31, 2018 |  | 2,684 |  |  | $ | 17.33 |
Granted |  | 1,189 |  |  | 15.14 |
Vested |  | (497 | ) |  | 16.15 |
Forfeited |  | (110 | ) |  | 17.59 |
Nonvested at June 30, 2018 |  | 3,266 |  |  | $ | 18.13 |

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- Definition Tabular disclosure for share-based compensation 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 (e) -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 (c)(2) -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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired 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 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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