Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Pension	$ 8,803	$ 15,403
Tax loss carryforwards	11,067	9,521
Inventory valuation	10,660	10,642
Other postretirement/postemployment costs	7,741	7,735
Accrued compensation	9,775	8,085
Goodwill	14,960	4,006
Lease obligation	9,790	9,846
Other	16,609	12,302
Valuation allowance	(3,869)	(3,757)
Total deferred tax assets	85,536	73,784
Deferred tax liabilities:
Depreciation and amortization	(94,286)	(109,391)
Goodwill	(9,909)	(9,850)
Swedish tax incentive	(8,531)	(9,170)
Right of use liability	(9,826)	(9,758)
Other	(7,712)	(5,191)
Total deferred tax liabilities	130,264	143,360
Non-current deferred tax assets	21,976	22,092
Non-current deferred tax liabilities	(66,704)	(91,668)
Net deferred tax liabilities	$ (44,728)	$ (69,576)