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ACQUISITIONS AND DISPOSITIONS - Purchase Price Allocation - Viya (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
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Jul. 01, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension funding required by acquisition |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,494 |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 63,970 |  |  |  | $ 63,970 |  |  |  | $ 62,873 | $ 63,970 | $ 63,970 | 62,873 |
Revenue |  | 107,806 | $ 121,138 | $ 117,788 | $ 104,475 | 107,701 | $ 122,132 | $ 123,245 | $ 128,115 |  | 451,207 | 481,193 | 457,003 |
Income before taxes |  | $ 11,336 | $ 27,920 | $ 12,868 | $ 1,618 | $ 41,196 | $ (21,860) | $ 13,505 | $ 14,712 |  | 53,742 | 47,553 | 45,374 |
Transaction-related charges |  |  |  |  |  |  |  |  |  |  | $ 2,642 | $ 1,009 | $ 18,064 |
Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement benefit obligations discount rate |  | 4.50% |  |  |  | 3.90% |  |  |  | 4.30% | 4.50% | 3.90% | 4.30% |
Viya (formerly Innovative) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 145,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price adjustments | 5,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | 51,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Pension funding required by acquisition |  |  |  |  |  |  |  |  |  | $ 22,500 |  |  |  |
Working capital adjustments and pension funding |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,800 |
Total value to allocate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | 111,860 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests | 221 |  |  |  |  |  |  |  |  |  |  |  |  |
Value to allocate | 112,081 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 4,229 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | 6,553 |  |  |  |  |  |  |  |  |  |  |  |  |
Materials & supplies | 6,533 |  |  |  |  |  |  |  |  |  |  |  |  |
Other current assets | 1,927 |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 108,284 |  |  |  |  |  |  |  |  |  |  |  |  |
Telecommunication licenses | 7,623 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 20,586 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 7,800 |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets | 4,394 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | (15,971) |  |  |  |  |  |  |  |  |  |  |  |  |
Advance payments and deposits | (7,793) |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability | (2,935) |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and other postretirement benefit liabilities | (29,149) |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired | 112,081 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 53,000 |
Income before taxes |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 |
Transaction related charges relating to legal, accounting and consulting services. | 4,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction-related charges |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200 | $ 1,900
Viya (formerly Innovative) | Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 5,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Viya (formerly Innovative) | Term loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Minimum | Viya (formerly Innovative) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement benefit obligations discount rate | 3.60% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Viya (formerly Innovative) | Income Approach |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted rate used for cash flows (as a percent) | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted rate used for fair value of noncontrolling interests | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Viya (formerly Innovative) | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Viya (formerly Innovative) | Telecommunication Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  | 39 years |  |  |
Maximum | Viya (formerly Innovative) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement benefit obligations discount rate | 3.90% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Viya (formerly Innovative) | Income Approach |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted rate used for cash flows (as a percent) | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted rate used for fair value of noncontrolling interests | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Viya (formerly Innovative) | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 13 years |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Viya (formerly Innovative) | Telecommunication Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |

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