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RETIREMENT PLANS - Net Assets and Allocations (Details) - Pension Plans - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension plan assets
Fair value of plan assets	$ 77,530	$ 80,892	$ 75,331
Weighted-average asset allocations (as a percent)	100.00%	100.00%
Level 1
Pension plan assets
Fair value of plan assets	$ 29,858	$ 41,827
Level 2
Pension plan assets
Fair value of plan assets	47,182	38,569
Level 3
Pension plan assets
Fair value of plan assets	490	496
Cash, cash equivalents, money markets and other
Pension plan assets
Fair value of plan assets	$ 5,173	$ 6,363
Weighted-average asset allocations (as a percent)	7.00%	8.00%
Cash, cash equivalents, money markets and other | Level 1
Pension plan assets
Fair value of plan assets	$ 5,173	$ 6,363
Common Stock
Pension plan assets
Fair value of plan assets	$ 23,052	$ 28,467
Weighted-average asset allocations (as a percent)	30.00%	35.00%
Common Stock | Level 1
Pension plan assets
Fair value of plan assets	$ 18,760	$ 25,312
Common Stock | Level 2
Pension plan assets
Fair value of plan assets	4,292	3,155
Mutual funds - fixed income
Pension plan assets
Fair value of plan assets	$ 16,444
Weighted-average asset allocations (as a percent)	21.00%
Mutual funds - fixed income | Level 2
Pension plan assets
Fair value of plan assets	$ 16,444
Exchange traded funds - equities
Pension plan assets
Fair value of plan assets		904
Exchange traded funds - equities | Level 1
Pension plan assets
Fair value of plan assets		904
Mutual funds - equities
Pension plan assets
Fair value of plan assets	$ 13,099	$ 9,248
Weighted-average asset allocations (as a percent)	17.00%	11.00%
Mutual funds - equities | Level 1
Pension plan assets
Fair value of plan assets	$ 4,748	$ 9,248
Mutual funds - equities | Level 2
Pension plan assets
Fair value of plan assets	8,351
Fixed income securities
Pension plan assets
Fair value of plan assets	$ 18,095	$ 35,414
Weighted-average asset allocations (as a percent)	23.00%	44.00%
Fixed income securities | Level 2
Pension plan assets
Fair value of plan assets	$ 18,095	$ 35,414
Annuities
Pension plan assets
Fair value of plan assets		496
Annuities | Level 3
Pension plan assets
Fair value of plan assets		$ 496
Other
Pension plan assets
Fair value of plan assets	$ 1,667
Weighted-average asset allocations (as a percent)	2.00%	2.00%
Other | Level 1
Pension plan assets
Fair value of plan assets	$ 1,177
Other | Level 3
Pension plan assets
Fair value of plan assets	$ 490

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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- Definition

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