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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2017
STOCK-BASED COMPENSATION PLANS [Abstract] |
Share Option and Award Activity | The following table summarizes our equity award activity during the years ended December 31, 2017, 2016 and 2015:
|  | Restricted Stock Award |  |  | Stock-Settled Appreciation Rights |
|  | Shares or Units |  |  | Weighted-Average Award Price |  |  | Rights |  |  | Weighted-Average Award Price |
Outstanding at December 31, 2014 |  |  | 321,322 |  |  | $ | 20.49 |  |  |  | 129,975 |  |  | $ | 16.04 |
Granted |  |  | 176,135 |  |  |  | 23.97 |  |  |  | — |  |  |  |  |
Restrictions lapsed or exercised (1) |  |  | (147,595 | ) |  |  | 18.94 |  |  |  | (29,100 | ) |  |  | 8.74 |
Forfeited or expired |  |  | (5,372 | ) |  |  | 24.84 |  |  |  | — |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 344,490 |  |  | $ | 22.87 |  |  |  | 100,875 |  |  | $ | 18.14 |
Granted |  |  | 209,394 |  |  |  | 18.80 |  |  |  | — |  |  |  |  |
Restrictions lapsed or exercised |  |  | (140,864 | ) |  |  | 20.55 |  |  |  | — |  |  |  |  |
Forfeited or expired |  |  | (15,700 | ) |  |  | 20.45 |  |  |  | — |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 397,320 |  |  | $ | 21.64 |  |  |  | 100,875 |  |  | $ | 18.14 |
Granted |  |  | 199,382 |  |  |  | 22.00 |  |  |  | — |  |  |  |  |
Restrictions lapsed or exercised(1) |  |  | (157,406 | ) |  |  | 22.02 |  |  |  | (43,875 | ) |  |  | 18.14 |
Forfeited or expired |  |  | (5,032 | ) |  |  | 20.09 |  |  |  | — |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 434,264 |  |  | $ | 21.69 |  |  |  | 57,000 |  |  | $ | 18.14 |
Exercisable at December 31, 2017 |  |  |  |  |  |  |  |  |  |  | 57,000 |  |  | $ | 18.14 |
Restricted units expected to vest |  |  | 417,590 |  |  | $ | 21.71 |  |  |  |  |  |  |  |  |
Exercisable at December 31, 2016 |  |  |  |  |  |  |  |  |  |  | 74,875 |  |  | $ | 18.14 |
Exercisable at December 31, 2015 |  |  |  |  |  |  |  |  |  |  | 48,875 |  |  | $ | 18.14 |
(1) The total intrinsic value of stock-settled appreciation rights exercised was approximately $457,000 in 2015 and $284,000 in 2017.

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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://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 Reference 2: 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 3: 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 + Details
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