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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 9 Months Ended
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Sep. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Changes in Accumulated Other Comprehensive Income/(Loss) by Component | Changes in Accumulated Other Comprehensive (Loss) Income by Component:
​ | Foreign Currency |  | Defined Benefit Pension Plans |  | Derivatives |  | Total
Balance - December 31, 2018 | $ | (248,401) |  |  | $ | (60,463) |  |  | $ | (1,640) |  |  | $ | (310,504) |
Other comprehensive (loss) income before reclassifications | (42,725) |  |  | — |  |  | 11,806 |  |  | (30,919) |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 2,150 |  |  | (12,399) |  |  | (10,249) |
Net current-period other comprehensive (loss) income | (42,725) |  |  | 2,150 |  |  | (593) |  |  | (41,168) |
Balance - September 30, 2019 | $ | (291,126) |  |  | $ | (58,313) |  |  | $ | (2,233) |  |  | $ | (351,672) |
​ |  |  |  |  |  |  |
Balance - December 31, 2019 | $ | (257,124) |  |  | $ | (83,147) |  |  | $ | (1,677) |  |  | $ | (341,948) |
Other comprehensive income (loss) before reclassifications | 19,282 |  |  | — |  |  | (4,342) |  |  | 14,940 |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 4,639 |  |  | 4,945 |  |  | 9,584 |
Net current-period other comprehensive income | 19,282 |  |  | 4,639 |  |  | 603 |  |  | 24,524 |
Balance - September 30, 2020 | $ | (237,842) |  |  | $ | (78,508) |  |  | $ | (1,074) |  |  | $ | (317,424) |
Reclassifications Out of Accumulated Other Comprehensive (Loss) Income | Reclassifications Out of Accumulated Other Comprehensive (Loss) Income:
Details about Accumulated Other Comprehensive Income Components | Amount Reclassified from Accumulated Other Comprehensive Income |  | Affected Line in the Statement Where Net Income is Presented
Three Months Ended September 30, | 2020 |  | 2019 |  |
​ | ​ |  | ​ |  | ​
Defined Benefit Pension Plans | ​ |  | ​ |  | ​
Amortization of net loss | $ | 1,966 |  |  | $ | 846 |  |  | (1)
Amortization of prior service cost | 101 |  |  | 111 |  |  | (1)
​ | 2,067 |  |  | 957 |  |  | Total before tax
​ | (504) |  |  | (244) |  |  | Tax impact
​ | $ | 1,563 |  |  | $ | 713 |  |  | Net of tax
Derivatives | ​ |  | ​ |  | ​
Changes in cross currency swap: interest component | $ | (146) |  |  | $ | (1,309) |  |  | Interest Expense
Changes in cross currency swap: foreign exchange component | 6,099 |  |  | (6,491) |  |  | Miscellaneous, net
​ | $ | 5,953 |  |  | $ | (7,800) |  |  | Net of tax
Total reclassifications for the period | $ | 7,516 |  |  | $ | (7,087) |  |  | ​
Details about Accumulated Other Comprehensive Income Components | Amount Reclassified from Accumulated Other Comprehensive Income |  | Affected Line in the Statement Where Net Income is Presented
Nine Months Ended September 30, | 2020 |  | 2019 |  |
​ | ​ |  | ​ |  | ​
Defined Benefit Pension Plans | ​ |  | ​ |  | ​
Amortization of net loss | $ | 5,836 |  |  | $ | 2,546 |  |  | (1)
Amortization of prior service cost | 293 |  |  | 337 |  |  | (1)
​ | 6,129 |  |  | 2,883 |  |  | Total before tax
​ | (1,490) |  |  | (733) |  |  | Tax impact
​ | $ | 4,639 |  |  | $ | 2,150 |  |  | Net of tax
Derivatives | ​ |  | ​ |  | ​
Changes in cross currency swap: interest component | $ | (1,434) |  |  | $ | (4,315) |  |  | Interest Expense
Changes in cross currency swap: foreign exchange component | 6,379 |  |  | (8,084) |  |  | Miscellaneous, net
​ | $ | 4,945 |  |  | $ | (12,399) |  |  | Net of tax
Total reclassifications for the period | $ | 9,584 |  |  | $ | (10,249) |  |  | ​
______________________________________________ (1)These accumulated other comprehensive income components are included in the computation of net periodic benefit costs, net of tax. See Note 8 – Retirement and Deferred Compensation Plans for additional details. ​

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