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Income Taxes - Net Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred income taxes: |  |
Deferred tax assets | $ 17,685 | $ 12,545
Liabilities | (166,407) | (214,779)
Total net deferred income tax liabilities | $ (148,722) | $ (202,234)

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