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Income Taxes - Net Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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)