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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets: |  |
Net operating loss carryforwards | $ 19,353 | $ 24,941
Operating and finance leases | 24,529 | 25,440
Pension liabilities | 36,085 | 24,925
Share-based compensation | 5,946 | 6,082
U.S. federal tax credits | 8,826 | 8,575
U.S. state tax credits | 7,011 | 7,881
Vacation and bonus | 12,307 | 7,645
Research and development | 8,992 | 7,539
Inventory | 4,854 | 5,993
Workers compensation | 3,353 | 3,835
Other | 16,643 | 16,496
Total gross deferred tax assets | 147,899 | 139,352
Less valuation allowance | (23,105) | (23,320)
Net deferred tax assets | 124,794 | 116,032
Deferred Tax Liabilities: |  |
Acquisition related intangibles | 57,295 | 62,851
Depreciation and amortization | 27,737 | 28,284
Operating and finance leases | 26,549 | 27,555
Other | 8,044 | 6,215
Total gross deferred tax liabilities | 119,625 | 124,905
Net deferred tax assets (liabilities) | $ 5,169 |
Net deferred tax assets (liabilities) |  | $ (8,873)

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