EMPLOYEE BENEFIT PLANS - Asset Allocations (Details) - Pension Plan - ARLP	12 Months Ended
Dec. 31, 2016
Equity securities
Employee Benefit Plans
Target allocation, minimum	45.00%
Target allocation	62.00%
Target allocation, maximum	80.00%
Fixed income securities
Employee Benefit Plans
Target allocation, minimum	10.00%
Target allocation	33.00%
Target allocation, maximum	55.00%
Real estate
Employee Benefit Plans
Target allocation, minimum	0.00%
Target allocation	5.00%
Target allocation, maximum	10.00%

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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