PENSION PLAN AND OTHER BENEFIT PLANS - Amounts Recognized, Assumptions Used, Target and Actual Allocation, Fair Value, Estimated Future Benefit Payments, and Other Disclosures (Details) - USD ($)
$ in Thousands

PENSION PLAN AND OTHER BENEFIT PLANS - Amounts Recognized, Assumptions Used, Target and Actual Allocation, Fair Value, Estimated Future Benefit Payments, and Other Disclosures (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): [Abstract]
Net actuarial (gain) loss		$ 5,369	$ (2,052)	$ (8,481)
Recognized actuarial loss		1,595	1,484	681
Prior service credit		1,101	0	0
Amortization of prior service benefit		(427)	(90)	(90)
Total before tax effect		7,638	(658)	$ (7,890)
Pension Plan
Amount recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss		10,788	17,863
Prior service cost		0	7
Total before tax effects		10,788	17,870
Accumulated benefit obligation		$ 39,800	$ 37,700
Principal actuarial assumptions used in determining projected benefit obligation [Abstract]
Discount rate		4.16%	4.39%	4.09%
Assumed rate of future compensation increase			5.00%	5.00%
Net periodic benefit cost [Abstract]
Service cost		$ 1,047	$ 1,231	$ 1,045
Interest cost		1,883	1,806	1,738
Expected return on plan assets		(3,019)	(3,287)	(3,174)
Recognized actuarial loss		1,549	1,414	649
Amortization of prior service cost		7	7	7
Net periodic cost		1,467	1,171	265
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): [Abstract]
Net actuarial (gain) loss		(5,526)	1,888	8,195
Recognized actuarial loss		(1,549)	(1,414)	(649)
Prior service credit		(7)	(7)	(7)
Total before tax effect		(7,082)	467	7,539
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)		(5,615)	$ 1,638	$ 7,804
Increase in unrecognized net loss		$ 7,100
Unrecognized net gain or loss increase threshold percentage for amortization of obligation (in hundredths)		10.00%
Average future working lifetime of active participants	8 years 9 months 4 days
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Loss recognition		$ 233
Prior service cost recognition		$ 0
Weighted-average assumptions for net periodic cost [Abstract]
Discount rate		4.39%	4.09%	4.92%
Expected long-term rate of return on assets		7.75%	7.75%	7.75%
Assumed rate of future compensation increase		5.00%	5.00%	5.00%
Target allocations of plan assets [Abstract]
Percentage of plan assets (in hundredths)		100.00%	100.00%
Expected long-term rate of return on assets		7.75%	7.75%	7.75%
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 41,560	$ 39,951	$ 43,336
Estimated benefit payments for each of next five years and aggregate amount expected to be paid [Abstract]
2017		2,055
2018		2,106
2019		2,150
2020		2,176
2021		2,213
2022-2026		$ 11,292
Pension Plan \| Minimum
Effect of a 1% decrease in health care trend rate on:
Evaluation period of expected long-term return on plan assets		3 years
Pension Plan \| Maximum
Effect of a 1% decrease in health care trend rate on:
Evaluation period of expected long-term return on plan assets		5 years
Pension Plan \| Carrying Value
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 41,560	39,951
Pension Plan \| Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		36,823	34,735
Pension Plan \| Fair Value \| Significant Other Observable Inputs (Level 2)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		4,737	5,216
Pension Plan \| Fair Value \| Significant Unobservable Inputs (Level 3)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 0	$ 0
Pension Plan \| Cash
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets		2.50%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)		0.00%
Target allocation, maximum (in hundredths)		20.00%
Percentage of plan assets (in hundredths)		3.00%	4.00%
Expected long-term rate of return on assets		2.50%
Pension Plan \| Cash \| Carrying Value
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 1,324	$ 1,486
Pension Plan \| Cash \| Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		1,324	1,486
Pension Plan \| Cash \| Fair Value \| Significant Other Observable Inputs (Level 2)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| Cash \| Fair Value \| Significant Unobservable Inputs (Level 3)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 0	$ 0
Pension Plan \| Alternative Assets
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets		7.50%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)		0.00%
Target allocation, maximum (in hundredths)		10.00%
Percentage of plan assets (in hundredths)		0.00%	2.00%
Expected long-term rate of return on assets		7.50%
Pension Plan \| Equity Securities - U.S. Companies \| Carrying Value
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 19,972	$ 23,424
Pension Plan \| Equity Securities - U.S. Companies \| Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		19,972	23,424
Pension Plan \| Equity Securities - U.S. Companies \| Fair Value \| Significant Other Observable Inputs (Level 2)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| Equity Securities - U.S. Companies \| Fair Value \| Significant Unobservable Inputs (Level 3)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| Equity Securities - International Companies \| Carrying Value
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		847	1,277
Pension Plan \| Equity Securities - International Companies \| Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		847	1,277
Pension Plan \| Equity Securities - International Companies \| Fair Value \| Significant Other Observable Inputs (Level 2)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| Equity Securities - International Companies \| Fair Value \| Significant Unobservable Inputs (Level 3)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| U.S. Treasuries/Government Bonds \| Carrying Value
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		2,218	2,468
Pension Plan \| U.S. Treasuries/Government Bonds \| Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| U.S. Treasuries/Government Bonds \| Fair Value \| Significant Other Observable Inputs (Level 2)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		2,218	2,468
Pension Plan \| U.S. Treasuries/Government Bonds \| Fair Value \| Significant Unobservable Inputs (Level 3)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| Corporate bonds and notes \| Carrying Value
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		2,519	2,748
Pension Plan \| Corporate bonds and notes \| Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| Corporate bonds and notes \| Fair Value \| Significant Other Observable Inputs (Level 2)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		2,519	2,748
Pension Plan \| Corporate bonds and notes \| Fair Value \| Significant Unobservable Inputs (Level 3)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| Mutual Funds \| Carrying Value
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		14,680	8,548
Pension Plan \| Mutual Funds \| Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		14,680	8,548
Pension Plan \| Mutual Funds \| Fair Value \| Significant Other Observable Inputs (Level 2)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		0	0
Pension Plan \| Mutual Funds \| Fair Value \| Significant Unobservable Inputs (Level 3)
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 0	$ 0
Pension Plan \| Large-Cap Domestic Equities
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets		10.30%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)		30.00%
Target allocation, maximum (in hundredths)		60.00%
Percentage of plan assets (in hundredths)		57.00%	58.00%
Expected long-term rate of return on assets		10.30%
Pension Plan \| Mid-Cap Domestic Equities
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets		10.60%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)		0.00%
Target allocation, maximum (in hundredths)		20.00%
Percentage of plan assets (in hundredths)		5.00%	4.00%
Expected long-term rate of return on assets		10.60%
Pension Plan \| Small-Cap Domestic Equities
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets		10.80%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)		0.00%
Target allocation, maximum (in hundredths)		15.00%
Percentage of plan assets (in hundredths)		2.00%	3.00%
Expected long-term rate of return on assets		10.80%
Pension Plan \| International Equities
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets		10.30%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)		0.00%
Target allocation, maximum (in hundredths)		25.00%
Percentage of plan assets (in hundredths)		7.00%	6.00%
Expected long-term rate of return on assets		10.30%
Pension Plan \| Intermediate Fixed Income
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets		4.70%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)		20.00%
Target allocation, maximum (in hundredths)		50.00%
Percentage of plan assets (in hundredths)		26.00%	23.00%
Expected long-term rate of return on assets		4.70%
Defined Benefit Health Care Plan
Amount recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss		$ 636	$ 517
Prior service cost		(1,101)	(434)
Total before tax effects		$ (465)	$ 83
Principal actuarial assumptions used in determining projected benefit obligation [Abstract]
Discount rate		4.16%	4.39%	4.09%
Net periodic benefit cost [Abstract]
Service cost		$ 43	$ 46	$ 39
Interest cost		66	70	72
Recognized actuarial loss		20	20	3
Recognized prior service benefit due to curtailments		(337)	0	0
Amortization of prior service cost		(97)	(97)	(97)
Net periodic cost		(305)	39	17
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): [Abstract]
Net actuarial (gain) loss		139	216	177
Recognized actuarial loss		(20)	(20)	(3)
Prior service credit		(1,101)	0	0
Amortization of prior service benefit		434	97	97
Total before tax effect		(548)	293	271
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)		(853)	$ 332	$ 288
Increase in unrecognized net loss		$ 119
Average future working lifetime of active participants		14 years 3 months 6 days	5 years 6 days
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Prior service cost recognition		$ (220)
Weighted-average assumptions for net periodic cost [Abstract]
Discount rate		4.39%	4.09%	4.92%
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 0	$ 0	$ 0
Estimated benefit payments for each of next five years and aggregate amount expected to be paid [Abstract]
2017		115
2018		104
2019		71
2020		49
2021		27
2022-2026		67
Effect of a 1% increase in health care trend rate on:
Benefit obligation		2	3	5
Total service and interest cost		0	0	0
Effect of a 1% decrease in health care trend rate on:
Benefit obligation		(3)	(3)	(6)
Total service and interest cost		$ 0	$ 0	$ 0
Health care cost trend: Initial		7.00%	7.00%	8.00%
Estimated employer contributions in next fiscal year		$ 115
Health care cost trend: Initial		6.50%	7.00%	7.00%
Health care cost trend: Ultimate		5.00%	5.00%	5.00%
Executive Supplemental Pension Plan
Amount recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss		$ 165	$ 173
Prior service cost		0	0
Total before tax effects		165	173
Accumulated benefit obligation		$ 1,200	$ 1,200
Principal actuarial assumptions used in determining projected benefit obligation [Abstract]
Discount rate		4.16%	4.39%	4.09%
Assumed rate of future compensation increase			5.00%	5.00%
Net periodic benefit cost [Abstract]
Service cost		$ 43	$ 44	$ 38
Interest cost		51	49	55
Recognized actuarial loss		26	50	29
Net periodic cost		120	143	122
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): [Abstract]
Net actuarial (gain) loss		18	(52)	110
Recognized actuarial loss		(26)	(50)	(29)
Total before tax effect		(8)	(102)	81
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)		$ 112	$ 41	$ 203
Unrecognized net gain or loss increase threshold percentage for amortization of obligation (in hundredths)		10.00%
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Loss recognition		$ 3
Prior service cost recognition		$ 0
Weighted-average assumptions for net periodic cost [Abstract]
Discount rate		4.39%	4.09%	4.92%
Assumed rate of future compensation increase			5.00%	5.00%
Fair value plan assets by asset class [Abstract]
Fair value of plan assets		$ 0	$ 0	$ 0
Estimated benefit payments for each of next five years and aggregate amount expected to be paid [Abstract]
2017		74
2018		108
2019		106
2020		104
2021		102
2022-2026		462
Effect of a 1% decrease in health care trend rate on:
Estimated employer contributions in next fiscal year		$ 75