INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets:
Net operating loss carryforwards	$ 47,660	$ 19,353
Operating and finance leases	22,492	24,529
Pension liabilities	29,770	36,085
Share-based compensation	6,764	5,946
U.S. federal tax credits	4,226	8,826
U.S. state tax credits	7,047	7,011
Vacation and bonus	13,450	12,307
Research and development	19,633	8,992
Inventory	6,969	4,854
Workers compensation	3,109	3,353
Other	16,194	16,643
Total gross deferred tax assets	177,314	147,899
Less valuation allowance	(47,149)	(23,105)
Net deferred tax assets	130,165	124,794
Deferred Tax Liabilities:
Acquisition related intangibles	68,174	57,295
Depreciation and amortization	30,997	27,737
Operating and finance leases	24,560	26,549
Other	7,489	8,044
Total gross deferred tax liabilities	131,220	119,625
Net deferred tax assets (liabilities)	$ (1,055)
Net deferred tax assets (liabilities)		$ 5,169