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STOCK-BASED COMPENSATION PLANS (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Plan $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of compensation plans | Plan |  | 2 |  |  |  |
Shares available for grant under 2014 LTIP Plan (in shares) |  | 842,000 |  |  |  |
Additional Disclosures [Abstract] |  |  |  |  |  |
Stock based compensation expense | $ |  | $ 3,818 |  | $ 3,872 | $ 4,033 |
Tax benefit recognized related to all awards | $ |  | 1,451 |  | $ 1,471 | $ 1,533 |
Total compensation cost related to unvested equity awards | $ |  | $ 4,486 |  |  |  |
Weighted-average period of recognition of cost |  | 2 years 3 months 18 days |  |  |  |
Restricted Stock Award [Member] |  |  |  |  |  |
Shares or Units and Rights [Roll Forward] |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  | 397,320 |  | 344,490 | 321,322 |
Granted (in shares) |  | 199,382 |  | 209,394 | 176,135 |
Restrictions lapsed or exercised (in shares) |  | (157,406) | [1] | (140,864) | (147,595) | [1]
Forfeited or expired (in shares) |  | (5,032) |  | (15,700) | (5,372) |
Restricted units expected to vest (in shares) |  | 417,590 |  |  |  |
Outstanding, ending balance (in shares) |  | 434,264 |  | 397,320 | 344,490 |
Weighted-Average Award Price [Roll Forward] |  |  |  |  |  |
Outstanding, beginning balance (in dollars per share) | $ / shares |  | $ 21.64 |  | $ 22.87 | $ 20.49 |
Granted (in dollars per share) | $ / shares |  | 22.00 |  | 18.80 | 23.97 |
Restrictions lapsed or exercised (in dollars per share) | $ / shares |  | 22.02 | [1] | 20.55 | 18.94 | [1]
Forfeited or expired (in dollars per share) | $ / shares |  | 20.09 |  | 20.45 | 24.84 |
Restricted units expected to vest (in dollars per share) | $ / shares |  | 21.71 |  |  |  |
Outstanding, ending balance (in dollars per share) | $ / shares |  | $ 21.69 |  | $ 21.64 | $ 22.87 |
Additional Disclosures [Abstract] |  |  |  |  |  |
Aggregate intrinsic value of outstanding awards | $ |  | $ 9,836 |  |  |  |
Fair value of vested restricted common stock | $ |  | $ 3,972 |  | $ 2,577 | $ 3,097 |
Vesting period of awards |  | 4 years |  |  |  |
Stock-Settled Appreciation Rights [Member] |  |  |  |  |  |
Shares or Units and Rights [Roll Forward] |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  | 100,875 |  | 100,875 | 129,975 |
Granted (in shares) |  | 0 |  | 0 | 0 |
Restrictions lapsed or exercised (in shares) |  | (43,875) | [1] | 0 | (29,100) | [1]
Forfeited or expired (in shares) |  | 0 |  | 0 | 0 |
Outstanding, ending balance (in shares) |  | 57,000 |  | 100,875 | 100,875 |
Exercisable, ending balance (in shares) |  | 57,000 |  | 74,875 | 48,875 |
Weighted-Average Award Price [Roll Forward] |  |  |  |  |  |
Outstanding, beginning balance (in dollars per share) | $ / shares |  | $ 18.14 |  | $ 18.14 | $ 16.04 |
Granted (in dollars per share) | $ / shares |  |  |  |  | 0 |
Restrictions lapsed or exercised (in dollars per share) | $ / shares | [1] | 18.14 |  |  | 8.74 |
Outstanding, ending balance (in dollars per share) | $ / shares |  | 18.14 |  | 18.14 | 18.14 |
Exercisable, ending balance (in dollars per share) | $ / shares |  | $ 18.14 |  | $ 18.14 | $ 18.14 |
Additional Disclosures [Abstract] |  |  |  |  |  |
Intrinsic value of awards exercised | $ |  | $ 284 |  |  | $ 457 |
Aggregate intrinsic value of vested awards | $ |  | 257 |  |  |  |
Aggregate intrinsic value of outstanding awards | $ |  | $ 257 |  |  |  |
Performance Units [Member] |  |  |  |  |  |
Additional Disclosures [Abstract] |  |  |  |  |  |
Vesting period of awards |  | 3 years |  |  |  |
Performance period |  | 1 year |  |  |  |
[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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