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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value Accounting (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets (liabilities) |  |
Other long-term assets | $ 5,038 | $ 4,461
Recurring basis | Level 1 |  |
Assets (liabilities) |  |
Pension plan assets | 5,231 | 5,362
Other long-term assets | 3,962 | 3,929
Recurring basis | Level 2 |  |
Assets (liabilities) |  |
Interest rate swaps | $ 434 |
Interest rate swaps |  | $ (196)

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