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Income Taxes - Significant Components To Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets: |  |
Accrued liabilities and other adjustments | $ 53,197 | $ 59,477
Net operating loss carryforwards | 99,240 | 92,952
Federal benefit of unrecognized tax benefits | 3,039 | 2,925
Valuation allowance | (60,003) | (55,666)
Deferred tax assets | 95,473 | 99,688
Deferred Tax Liabilities: |  |
Other assets, principally due to differences in amortization | (177,645) | (166,469)
Plant and equipment, principally due to differences in depreciation | (67,515) | (74,147)
Other | (21,903) | (26,260)
Deferred tax liabilities | (267,063) | (266,876)
Net deferred tax liability | $ (171,590) | $ (167,188)

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