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Income Taxes (Summary of the Total Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Lease liabilities | $ 30,875 |
Tax carryforwards | 16,305 | $ 19,058
Inventories | 1,704 | 2,041
Accrued liabilities | 10,020 | 9,860
Employee benefits | 4,853 | 4,892
Other | 9,005 | 9,347
Total deferred tax assets | 72,762 | 45,198
Less: Valuation allowance | 12,296 | 14,219
Deferred tax assets, net of valuation allowance | 60,466 | 30,979
Deferred Tax Liabilities, Lease Right-Of-Use Assets | 30,875 |
Deferred tax liabilities |  |
Depreciation and depletion | 28,061 | 27,299
Partnership investment - development costs | 9,949 | 5,146
Accrued pension benefits | 3,919 | 1,380
Total deferred tax liabilities | 72,804 | 33,825
Net deferred liability | $ (12,338) | $ (2,846)

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