Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	$ 183,092	$ 176,830
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(18,845)	(20,268)
Pension and post-retirement benefit plan adjustments
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(2,517)	(4,008)
Unrealized income (loss) on interest rate swap contracts
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	68	(766)
Foreign currency translation adjustments
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	$ (16,396)	$ (15,494)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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+ Details