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Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amounts recognized in the consolidated balance sheets |  |
Employee benefit plan obligations | $ (22,542) | $ (26,716)
Pension Benefits |  |
Amounts recognized in the consolidated balance sheets |  |
Accrued expenses | (1,516) | (1,232)
Employee benefit plan obligations | (2,846) | (4,600)
Net amount recognized | (4,362) | (5,832)
Postretirement Benefits |  |
Amounts recognized in the consolidated balance sheets |  |
Accrued expenses | (1,162) | (1,098)
Employee benefit plan obligations | (19,476) | (21,504)
Net amount recognized | $ (20,638) | $ (22,602)

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