RETIREMENT PLANS (Fair Value Measurements) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 38,715	$ 36,880	$ 38,163
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,687	17,618
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,888	17,463
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,140	1,799
Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,175	1,437
Level 1 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,512	16,181
Level 2 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,888	17,463
Level 2 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,140	1,799
Level 3 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0