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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Transactions Involving Stock Units and Director Stock Grants | Transactions involving our stock units and director stock grants for the twelve months ended December 31, 2018 are summarized below:
| Twelve Months Ended December 31, 2018
| No. of Stock Units |  | Weighted Average Fair Value
| (in thousands) |  |
Stock and stock units, beginning of year | 854 |  |  | $ | 21.42 |
Changes during the year: |  |  |
Granted | 370 |  |  | $ | 18.09 |
Vested and settled | (291 | ) |  | $ | 24.76 |
Cancelled | (77 | ) |  | $ | 21.37 |
Stock and stock units, end of year | 856 |  |  | $ | 18.79 |
Summary of Transactions Involving Performance Awards | Transactions involving our performance awards during the twelve months ended December 31, 2018 are summarized below:
| Twelve Months Ended December 31, 2018
| Performance Units Subject to Market Conditions |  | Performance Units Not Subject to Market Conditions
| No. of Stock Units 1 |  | Weighted Average Fair Value |  | No. of Stock Units 1 |  | Weighted Average Fair Value
| (in thousands) |  |  |  | (in thousands) |  |
Performance stock units, beginning of period | 45 |  |  | $ | 17.66 |  |  | 84 |  |  | $ | 25.76 |
Changes during the period: |  |  |  |  |  |  |
Granted | 465 |  |  | $ | 14.24 |  |  | 115 |  |  | $ | 15.00 |
Vested and settled | — |  |  | $ | — |  |  | (15 | ) |  | $ | 13.45 |
Cancelled | (15 | ) |  | $ | 16.78 |  |  | (39 | ) |  | $ | 27.95 |
Performance stock units, end of period | 495 |  |  | $ | 14.47 |  |  | 145 |  |  | $ | 17.88 |
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1 | Performance units with variable payouts are shown at target level of performance.
Summary of Transactions Involving Stock Options | Transactions involving our stock options for the twelve months ended December 31, 2018 are summarized below:
| Twelve Months Ended December 31, 2018
| No. of Options |  | Weighted Average Exercise Price
| (in thousands) |  |
Shares under option, beginning of year | 79 |  |  | $ | 31.94 |
Changes during the year: |  |  |
Granted | — |  |  | $ | — |
Exercised | — |  |  | $ | — |
Cancelled | — |  |  | $ | — |
Expired | (27 | ) |  | $ | 30.75 |
Shares under option, end of year | 52 |  |  | $ | 32.56 |
Exercisable at end of year | 52 |  |  | $ | 32.56 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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