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OTHER COMPREHENSIVE INCOME (reclassification adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Other income |  |  |  |  | $ 7,203 | $ 9,214 | $ 7,193
Interest expense |  |  |  |  | (55,554) | (23,140) | (34,682)
Income tax provision |  |  |  |  | (31,031) | (21,468) | (8,039)
Total revenue | $ 454,492 | $ 439,461 | $ 410,405 | $ 486,423 | 2,022,197 | 1,790,781 | 2,008,715
Net income (loss) |  |  |  |  | 62,772 | 5,335 | (223,779)
Service [Member] |  |  |  |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Total revenue |  |  |  |  | 777,668 | 560,143 | 599,560
Amounts reclassified from accumulated other comprehensive loss [Member] |  |  |  |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | (1,354) | (1,400) | (1,472)
Prior service credit [Member] | Amounts reclassified from accumulated other comprehensive loss [Member] |  |  |  |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Other income |  |  |  |  | 1,421 | 1,421 | 1,421
Net actuarial loss [Member] | Amounts reclassified from accumulated other comprehensive loss [Member] |  |  |  |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Other income |  |  |  |  | (1,629) | (2,301) | (3,223)
Total amortization [Member] | Amounts reclassified from accumulated other comprehensive loss [Member] |  |  |  |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Other income |  |  |  |  | (208) | (880) | (1,802)
Income tax provision |  |  |  |  | (123) | 46 | 273
Net income (loss) |  |  |  |  | (331) | (834) | (1,529)
Realized (loss) gain on interest rate swap [Member] | Amounts reclassified from accumulated other comprehensive loss [Member] |  |  |  |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Interest expense |  |  |  |  | (1,384) | (968) | 77
Income tax provision |  |  |  |  | 361 | 249 | (20)
Net income (loss) |  |  |  |  | (1,023) | (719) | 57
Realized gain on debt securities [Member] | Amounts reclassified from accumulated other comprehensive loss [Member] |  |  |  |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Income tax provision |  |  |  |  | 0 | 53 | 0
Net income (loss) |  |  |  |  | 0 | 153 | 0
Realized gain on debt securities [Member] | Amounts reclassified from accumulated other comprehensive loss [Member] | Service [Member] |  |  |  |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |  |  |  |
Total revenue |  |  |  |  | $ 0 | $ 206 | $ 0

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