EMPLOYEE BENEFIT PLANS - Multi-employer (Details) - Multi-employer defined benefit pension plan - USD ($) $ in Thousands		12 Months Ended
Jun. 12, 2012	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Multiemployer Plans [Line Items]
Percentage of funded status					51.60%
Employer contributions to multi-employer defined benefit pension plans		$ 2,943	$ 2,836	$ 2,603
Insolvent period		20 years
Estimated liability upon withdrawal from plan		$ 99,800	81,600	82,200
Percentage of annual compounded surcharge for rehabilitation		5.00%
Percentage of interim surcharge	5.00%
Pension expense		$ 2,961	2,836	2,617
Surcharges		$ 948	$ 811	$ 656

Plan assets of a multiemployer plan, as a percentage of projected benefit obligation.

No definition available.

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- Definition

The portion of the entity's pension expense for the multiemployer plan that represents an increase in the surcharge, during the period.

+ References

No definition available.

+ Details

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- Definition

Estimated amount of the obligation that would be recognized due to withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the number of years until the Plan is expected to become insolvent based on the "critical and declining status" designation.

+ References

No definition available.

+ Details

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- Definition

Represents employer payable surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Represents employer payable compounded annual surcharge for rehabilitation within a specified period to the pension or postretirement benefit plan to which two or more unrelated employers contribute, where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

+ Details

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Balance Type:	credit
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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