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Income Taxes - Net Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred income taxes:    
Assets $ 12,545 $ 16,939
Liabilities (214,779) (219,115)
Total net deferred income tax liabilities $ (202,234) $ (202,176)