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STOCKHOLDERS' EQUITY (AOCI) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | --- | ---
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Total after-tax amount | $ 763,626 | $ 743,159 | $ 721,755 | $ 717,682 | $ 705,091 | $ 668,515 | $ 665,474 | $ 651,462
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Total pre-tax amount | (10,292) |  |  | (13,836) |  |  |  |
Total after-tax amount | (7,630) | $ (12,429) | $ (12,388) | (14,238) | (22,620) | $ (17,842) | $ (20,078) | (20,574)
Unrecognized Net Periodic Benefit Costs |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Total pre-tax amount | (7,068) |  |  | (11,821) |  |  |  |
Total after-tax amount | (5,249) |  |  | (12,749) | (22,357) |  |  | (19,715)
Interest Rate Swap, 2019 |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Total pre-tax amount | (822) |  |  |  |  |  |  |
Total after-tax amount | (607) |  |  | 591 |  |  |  |
Interest Rate Swap, 2018 |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Total pre-tax amount |  |  |  | 801 |  |  |  |
Total after-tax amount |  |  |  | 591 | 1,301 |  |  | 292
Foreign Currency Translation |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Total pre-tax amount | (2,402) |  |  | (2,816) |  |  |  |
Total after-tax amount | $ (1,774) |  |  | $ (2,080) | $ (1,564) |  |  | $ (1,151)

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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