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RETIREMENT PLANS - Benefit Obligations and Plan Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Pension Plans |  |  |  |  |
Projected benefit obligations: |  |  |  |  |
Balance at beginning of year | $ 76,119 | $ 14,400 |  |  |
Viya acquisition |  | 69,178 |  |  |
Service cost | 1,676 | 1,308 | $ 652 |  |
Interest cost | 3,388 | 2,002 | 766 |  |
Curtailment |  | 128 |  |  |
Benefits and settlements paid | (3,942) | (6,445) |  |  |
Actuarial (gain) loss | 3,114 | (4,437) |  |  |
Experience Loss |  | (15) |  |  |
Balance at end of year | 80,355 | 76,119 | 14,400 |  |
Plan net assets: |  |  |  |  |
Balance at beginning of year | 75,331 | 11,946 |  |  |
Viya acquisition |  | 45,116 |  |  |
Actual return on plan assets | 8,789 | 1,717 |  |  |
Company contributions | 842 | 22,963 |  |  |
Benefits and settlements paid | (4,070) | (6,411) |  |  |
Balance at end of year | 80,892 | 75,331 | 11,946 |  |
Funded status of plan |  |  |  |  |
Projected benefit obligation | 76,119 | 14,400 | 14,400 | $ 80,355 | $ 76,119
Plan Net Assets | 75,331 | 11,946 | $ 11,946 | 80,892 | 75,331
Under funded status of plan |  |  |  | 537 | (788)
Pension Plans | GT&T Pension Benefit |  |  |  |  |
Projected benefit obligations: |  |  |  |  |
Balance at beginning of year | 12,549 |  |  |  |
Balance at end of year | 13,205 | 12,549 |  |  |
Plan net assets: |  |  |  |  |
Balance at beginning of year | 8,655 |  |  |  |
Balance at end of year | 10,307 | 8,655 |  |  |
Funded status of plan |  |  |  |  |
Projected benefit obligation | 12,549 | 12,549 |  | 13,205 | 12,549
Plan Net Assets | $ 8,655 | 8,655 |  | 10,307 | 8,655
Under funded status of plan |  |  |  | (2,898) | (3,894)
Pension Plans | GT&T Pension Benefit | Minimum |  |  |  |  |
Funded status of plan |  |  |  |  |
Percentage of plan assets to be invested within Guyana | 70.00% |  |  |  |
Pension Plans | GT&T Pension Benefit | Maximum |  |  |  |  |
Funded status of plan |  |  |  |  |
Percentage of plan assets to be invested within Guyana | 80.00% |  |  |  |
Pension Plans | Viya Pension Benefit |  |  |  |  |
Projected benefit obligations: |  |  |  |  |
Balance at beginning of year | $ 63,571 |  |  |  |
Balance at end of year | 67,150 | 63,571 |  |  |
Plan net assets: |  |  |  |  |
Balance at beginning of year | 66,676 |  |  |  |
Balance at end of year | 70,585 | 66,676 |  |  |
Funded status of plan |  |  |  |  |
Projected benefit obligation | 63,571 | 63,571 |  | 67,150 | 63,571
Plan Net Assets | 66,676 | 66,676 |  | 70,585 | 66,676
Under funded status of plan |  |  |  | 3,435 | 3,105
Postretirement Benefits |  |  |  |  |
Projected benefit obligations: |  |  |  |  |
Balance at beginning of year | 5,108 |  |  |  |
Viya acquisition |  | 5,472 |  |  |
Service cost | 183 | 97 |  |  |
Interest cost | 206 | 97 |  |  |
Benefits and settlements paid | (367) | (206) |  |  |
Actuarial (gain) loss | 177 | (325) |  |  |
Experience Loss |  | (27) |  |  |
Balance at end of year | 5,307 | 5,108 |  |  |
Plan net assets: |  |  |  |  |
Company contributions | 367 | 206 |  |  |
Benefits and settlements paid | (367) | (206) |  |  |
Funded status of plan |  |  |  |  |
Projected benefit obligation | $ 5,108 | $ 5,108 |  | 5,307 | 5,108
Under funded status of plan |  |  |  | (5,307) | (5,108)
Restricted cash |  |  |  | $ 0 | $ 5,100

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- Definition Represents the amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes the amount of decrease that relates to 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 Represents the amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes the amount that relates to 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 The amount of Experience loss under the Defined benefit plan. + References No definition available. + Details
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- Definition Represents the percentage of plan assets to be invested within country other than country of domicile of the entity. + References No definition available. + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in plan assets of defined benefit plan from business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References 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)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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