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STOCK-BASED COMPENSATION PLANS (Details) $ / shares in Units, $ in Thousands		12 Months Ended
		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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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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