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EMPLOYEE RETIREMENT PLANS - Qualified Defined-benefit Pension Plan Weighted Average Asset Allocation (Details) - Qualified | Dec. 31, 2016 | Dec. 31, 2015
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Plan Assets |  |
Weighted average asset allocation (as a percent) | 100.00% | 100.00%
Equity securities |  |
Plan Assets |  |
Weighted average asset allocation (as a percent) | 49.00% | 49.00%
Debt securities |  |
Plan Assets |  |
Weighted average asset allocation (as a percent) | 32.00% | 32.00%
Other |  |
Plan Assets |  |
Weighted average asset allocation (as a percent) | 19.00% | 19.00%

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + 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) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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