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OTHER COMPREHENSIVE INCOME (Tables) | 12 Months Ended
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Dec. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Reclassification adjustments | Information regarding amounts reclassified from accumulated other comprehensive loss to net income (loss) was as follows:
Accumulated other comprehensive loss components |  | Amounts reclassified from accumulated other comprehensive loss |  | Affected line item in consolidated statements of income (loss)
(in thousands) |  | 2021 |  | 2020 |  | 2019 |  |
Amortization of postretirement benefit plan items: |  |  |  |  |  |  |  |
Prior service credit |  | $ | 1,421 |  |  | $ | 1,421 |  |  | $ | 1,421 |  |  | Other income
Net actuarial loss |  | (1,629) |  |  | (2,301) |  |  | (3,223) |  |  | Other income
Total amortization |  | (208) |  |  | (880) |  |  | (1,802) |  |  | Other income
Tax (expense) benefit |  | (123) |  |  | 46 |  |  | 273 |  |  | Income tax provision
Amortization of postretirement benefit plan items, net of tax |  | (331) |  |  | (834) |  |  | (1,529) |  |  | Net income (loss)
Interest rate swap: |  |  |  |  |  |  |  |
Realized (loss) gain on interest rate swap |  | (1,384) |  |  | (968) |  |  | 77 |  |  | Interest expense
Tax benefit (expense) |  | 361 |  |  | 249 |  |  | (20) |  |  | Income tax provision
Realized (loss) gain on interest rate swap, net of tax |  | (1,023) |  |  | (719) |  |  | 57 |  |  | Net income (loss)
Debt securities: |  |  |  |  |  |  |  |
Realized gain on debt securities |  | — |  |  | 206 |  |  | — |  |  | Service revenue
Tax expense |  | — |  |  | (53) |  |  | — |  |  | Income tax provision
Realized gain on debt securities, net of tax |  | — |  |  | 153 |  |  | — |  |  | Net income (loss)
Total reclassifications, net of tax |  | $ | (1,354) |  |  | $ | (1,400) |  |  | $ | (1,472) |  |  |
Accumulated other comprehensive loss | Changes in the components of accumulated other comprehensive loss were as follows:
(in thousands) |  | Postretirement benefit plans |  | Net unrealized loss on available-for-sale debt securities |  | Net unrealized loss on cash flow hedge |  | Currency translation adjustment |  | Accumulated other comprehensive loss
Balance, December 31, 2018 |  | $ | (36,529) |  |  | $ | (323) |  |  | $ | — |  |  | $ | (19,727) |  |  | $ | (56,579) |
Other comprehensive income (loss) before reclassifications |  | 6,594 |  |  | 48 |  |  | (1,040) |  |  | 1,558 |  |  | 7,160 |
Amounts reclassified from accumulated other comprehensive loss |  | 1,529 |  |  | — |  |  | (57) |  |  | — |  |  | 1,472 |
Net current-period other comprehensive income (loss) |  | 8,123 |  |  | 48 |  |  | (1,097) |  |  | 1,558 |  |  | 8,632 |
Balance, December 31, 2019 |  | (28,406) |  |  | (275) |  |  | (1,097) |  |  | (18,169) |  |  | (47,947) |
Other comprehensive income (loss) before reclassifications |  | 5,616 |  |  | 338 |  |  | (4,973) |  |  | 4,133 |  |  | 5,114 |
Amounts reclassified from accumulated other comprehensive loss |  | 834 |  |  | (153) |  |  | 719 |  |  | — |  |  | 1,400 |
Net current-period other comprehensive income (loss) |  | 6,450 |  |  | 185 |  |  | (4,254) |  |  | 4,133 |  |  | 6,514 |
Balance, December 31, 2020 |  | (21,956) |  |  | (90) |  |  | (5,351) |  |  | (14,036) |  |  | (41,433) |
Other comprehensive income (loss) before reclassifications |  | 6,194 |  |  | (254) |  |  | 2,067 |  |  | 580 |  |  | 8,587 |
Amounts reclassified from accumulated other comprehensive loss |  | 331 |  |  | — |  |  | 1,023 |  |  | — |  |  | 1,354 |
Net current-period other comprehensive income (loss) |  | 6,525 |  |  | (254) |  |  | 3,090 |  |  | 580 |  |  | 9,941 |
Balance, December 31, 2021 |  | $ | (15,431) |  |  | $ | (344) |  |  | $ | (2,261) |  |  | $ | (13,456) |  |  | $ | (31,492) |

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