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Retirement Plans, Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Pension Plan [Member] |  |
Amounts recognized in the consolidated balance sheets [Abstract] |  |
Noncurrent asset | $ 0 | $ 0
Current liability | 0 | 0
Long-term liability | (78,332) | (59,999)
SERP [Member] |  |
Amounts recognized in the consolidated balance sheets [Abstract] |  |
Noncurrent asset | 0 | 0
Current liability | (158) | (159)
Long-term liability | (1,087) | (1,253)
Other Postretirement Benefits [Member] |  |
Amounts recognized in the consolidated balance sheets [Abstract] |  |
Noncurrent asset | 0 | 0
Current liability | (65) | (54)
Long-term liability | $ (678) | $ (625)

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