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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