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EMPLOYEE BENEFIT PLANS (Settlement distributions and expense) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Distributions and pension settlement expense |  |  |  |
Pension settlement expense, pre-tax |  | $ 3,229 | $ 3,202 | $ 6,595
Nonunion Defined Benefit Pension Plan |  |  |  |
Distributions and pension settlement expense |  |  |  |
Pension settlement distributions |  | 16,515 | 20,622 | 57,518
Pension settlement expense, pre-tax |  | $ 3,023 | $ 3,202 | $ 5,880
Pension settlement expense per diluted share, net of taxes |  | $ 0.07 | $ 0.07 | $ 0.14
Lump-sum distributions |  |  |  | $ 32,100
Premium paid to purchase nonparticipating annuity contract | $ 25,400 |  |  | 25,400
Supplemental Benefit Plan |  |  |  |
Distributions and pension settlement expense |  |  |  |
Pension settlement distributions |  | $ 246 | $ 1,941 | 853
Pension settlement expense, pre-tax |  | $ 206 |  | $ 715
Pension settlement expense per diluted share, net of taxes |  | $ 0.01 |  | $ 0.02
Period of delay for pension settlement distribution to key employees |  |  | 6 months |

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- Definition The amount of lump sum benefit distributions paid. + References No definition available. + Details
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- Definition The amount of net gain (loss), per diluted share, net of taxes, recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. + References No definition available. + Details
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- Definition Amount of premium paid for nonparticipating annuity contract to settle vested benefit obligations of participants and beneficiaries receiving monthly benefits. + References No definition available. + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of plan assets that relate to an irrevocable action that relieves the employer, or plan, of primary responsibility for a benefit obligation and eliminates risks related to the obligation and the assets used to effect settlement. Includes, but is not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified pension benefits and purchasing annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 126 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36091-114959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(8) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 66 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12688-114930 + Details
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