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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Balances | $ 651,462 | $ 599,055 | $ 588,728
Adjusted Balances |  | 651,878 |
OTHER COMPREHENSIVE INCOME, net of tax | 9,912 | 2,843 | 4,079
Balances | 717,682 | 651,462 | 599,055
Accumulated Other Comprehensive Loss |  |  |
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Balances | (20,574) | (23,417) | (27,496)
Adjusted Balances |  | (24,150) |
Other comprehensive income (loss) before reclassifications | (1,821) | (1,968) |
Amounts reclassified from accumulated other comprehensive loss | 11,733 | 4,811 |
OTHER COMPREHENSIVE INCOME, net of tax | 9,912 | 2,843 | 4,079
Balances | (14,238) | (20,574) | (23,417)
Unrecognized Net Periodic Benefit Costs |  |  |
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Balances | (19,715) | (21,886) |
Adjusted Balances |  | (23,106) |
Other comprehensive income (loss) before reclassifications | (1,376) | (2,640) |
Amounts reclassified from accumulated other comprehensive loss | 11,733 | 4,811 |
OTHER COMPREHENSIVE INCOME, net of tax | 10,357 | 2,171 |
Balances | (12,749) | (19,715) | (21,886)
Interest Rate Swap |  |  |
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Balances | 292 | (329) |
Adjusted Balances |  | 355 |
Other comprehensive income (loss) before reclassifications | 236 | 621 |
OTHER COMPREHENSIVE INCOME, net of tax | 236 | 621 |
Balances | 591 | 292 | (329)
Foreign Currency Translation |  |  |
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Balances | (1,151) | (1,202) |
Adjusted Balances |  | (1,399) |
Other comprehensive income (loss) before reclassifications | (681) | 51 |
OTHER COMPREHENSIVE INCOME, net of tax | (681) | 51 |
Balances | $ (2,080) | (1,151) | $ (1,202)
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Loss |  |  |
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard |  | (3,576) |
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Unrecognized Net Periodic Benefit Costs |  |  |
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard |  | (3,391) |
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Interest Rate Swap |  |  |
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard |  | 63 |
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Foreign Currency Translation |  |  |
Changes in accumulated other comprehensive loss, net of tax, by component |  |  |
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard |  | $ (248) |

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