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STOCKHOLDERS' EQUITY - AOCI (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accumulated Other Comprehensive Income |  |  |  |  |  |
Total after-tax amount | $ 1,211,361 | $ 1,205,859 | $ 1,151,401 | $ 1,063,212 | $ 983,172 | $ 929,067
Accumulated Other Comprehensive Income |  |  |  |  |  |
Accumulated Other Comprehensive Income |  |  |  |  |  |
Total pre-tax amount | 8,846 |  | 9,566 |  |  |
Total after-tax amount | 6,569 | $ 6,386 | 7,103 | 4,974 | $ 5,323 | 3,699
Unrecognized Net Periodic Benefit Credit |  |  |  |  |  |
Accumulated Other Comprehensive Income |  |  |  |  |  |
Total pre-tax amount | 8,622 |  | 9,287 |  |  |
Total after-tax amount | 6,402 |  | 6,896 | 3,879 |  | 4,160
Interest Rate Swap |  |  |  |  |  |
Accumulated Other Comprehensive Income |  |  |  |  |  |
Total pre-tax amount | 2,955 |  | 3,526 |  |  |
Total after-tax amount | 2,183 |  | 2,604 | 2,111 |  | 309
Foreign Currency Translation |  |  |  |  |  |
Accumulated Other Comprehensive Income |  |  |  |  |  |
Total pre-tax amount | (2,731) |  | (3,247) |  |  |
Total after-tax amount | $ (2,016) |  | $ (2,397) | $ (1,016) |  | $ (770)

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