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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Changes in defined benefit pension plans, tax amount | $ (1,156,000) | $ 2,557,000 | $ 4,152,000
Changes in other, tax amount | $ (77,000) | $ (22,000) | $ (136,000)

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