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INCOME TAXES, Deferred Income Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets [Abstract] |  |
State tax credits | $ 1,033 | $ 902
Unfunded pension liability | 1,139 | 1,398
Reserves and accruals | 2,828 | 4,335
Deferred tax assets, net operating loss carryforwards | 10,524 | 12,891
Depreciation | 917 | 1,057
Amortization | 0 | 0
Other accruals | 4,915 | 8,278
Total deferred tax assets | 21,356 | 28,861
Deferred tax liabilities [Abstract] |  |
Reserves and accruals | 0 | 64
Depreciation | 989 | 3,028
Amortization | 8,490 | 15,361
Other accruals | 946 | 973
Total deferred tax liabilities | 10,425 | 19,426
Valuation allowance | 8,343 | 7,485
Net deferred tax assets/(liabilities) | $ 2,588 | $ 1,950

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