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Employee Benefit Plans (Amounts Recognized in the Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Pension Benefits [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Noncurrent liabilities | $ (6,510) | $ (5,841)
Net amount recognized at December 31 | (6,510) | (5,841)
Postretirement Benefit Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Current liabilities | (181) | (395)
Noncurrent liabilities | (420) | (4,975)
Net amount recognized at December 31 | $ (601) | $ (5,370)

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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 + Details
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