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PENSION PLANS AND OTHER POST RETIREMENT BENEFITS - Components of Net Pension Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020
Assumptions: |  |  |  |  |
Net pension expense |  |  | $ 3,120 | $ 2,895 |
Pension Plan |  |  |  |  |
Assumptions: |  |  |  |  |
Service cost | $ 584 | $ 534 | 1,182 | 1,054 | $ 2,138
Interest cost | 324 | 287 | 630 | 570 | 1,164
Amortization of actuarial (gains) and losses | 210 | 224 | 411 | 448 |
Net pension expense | 1,118 | 1,045 | 2,223 | 2,072 |
Pension Plan | CDT |  |  |  |  |
Assumptions: |  |  |  |  |
Service cost | 121 | 144 | 237 | 286 | 572
Interest cost | 129 | 115 | 253 | 229 | 459
Amortization of actuarial (gains) and losses | 181 | 235 | 354 | 469 |
Net pension expense | 431 | 494 | 844 | 984 |
Pension Plan | GXS GER |  |  |  |  |
Assumptions: |  |  |  |  |
Service cost | 53 | 80 | 104 | 159 | 319
Interest cost | 93 | 84 | 182 | 168 | 337
Amortization of actuarial (gains) and losses | 29 | 61 | 57 | 122 |
Net pension expense | 175 | 225 | 343 | 449 |
Pension Plan | GXS PHP |  |  |  |  |
Assumptions: |  |  |  |  |
Service cost | 410 | 310 | 841 | 609 | 1,247
Interest cost | 102 | 88 | 195 | 173 | $ 368
Amortization of actuarial (gains) and losses | 0 | (72) | 0 | (143) |
Net pension expense | $ 512 | $ 326 | $ 1,036 | $ 639 |

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