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Pensions and Other Post-retirement Benefits - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Aggregate accumulated benefit obligations (ABO)	$ 159,545	$ 169,065
Aggregate projected benefit obligations (PBO)	168,819	182,159
Aggregate fair value of plan assets	$ 28,876	$ 31,471

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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