Income Taxes - Components of deferred income tax liabilities and assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax liabilities:
Book over tax basis of intangible assets and fixed assets	$ (55,449)	$ (65,724)
Unremitted foreign earnings	(7,135)	(6,063)
Operating lease and finance lease right-of-use assets	(9,573)	(11,597)
Other, net	(1,584)	(2,604)
Total deferred income tax liabilities	(73,741)	(85,988)
Deferred income tax assets:
Allowance for doubtful accounts and receivable adjustments	1,816	1,704
Inventory	2,362	1,677
Accrued liabilities	12,606	15,345
Net operating loss and tax credit carryforwards	141,946	171,148
Tax deductible goodwill	4,424	6,171
Disallowed Interest Deduction	106,449	74,672
Operating lease and finance lease liabilities	10,211	13,004
Other, net	18,197	19,334
Total deferred income tax assets	298,011	303,055
Valuation allowance	(233,755)	(220,030)
Total net deferred income tax assets (liabilities)	(9,485)	$ (2,963)
Increase (decrease) in valuation allowance	13,700
Federal
Deferred income tax assets:
Valuation allowance related to disallowed interest deduction	89,000
Valuation allowance related to limitation of utilization of NOL carryforwards	60,400
State
Deferred income tax assets:
Valuation allowance related to disallowed interest deduction	12,200
Valuation allowance related to limitation of utilization of NOL carryforwards	4,700
Foreign.
Deferred income tax assets:
Valuation allowance related to disallowed interest deduction	$ 67,500