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Other Items Impacting Comparability - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Items Impacting Comparability [Abstract]      
Tax reform related bonus $ 0 $ 0 $ 23,278
Operating tax adjustment $ 0 $ 0 $ 2,205