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Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amounts recognized in the consolidated balance sheets |  |
Employee benefit plan obligations | $ (25,359) | $ (22,542)
Pension Benefits |  |
Amounts recognized in the consolidated balance sheets |  |
Accrued expenses | (1,309) | (1,516)
Employee benefit plan obligations | (1,779) | (2,846)
Net amount recognized | (3,088) | (4,362)
Postretirement Benefits |  |
Amounts recognized in the consolidated balance sheets |  |
Accrued expenses | (1,292) | (1,162)
Employee benefit plan obligations | (23,580) | (19,476)
Net amount recognized | $ (24,872) | $ (20,638)

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