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Income Taxes Income Taxes (Notes)
9 Months Ended
Sep. 30, 2019
Income Taxes [Abstract]  
Income Tax Disclosure [Text Block] Income Taxes
The effective tax rate was (4.15)% and 17.15% for the three and nine months ended September 30, 2019, compared to 16.56% and 35.63% for the respective periods in 2018. The effective tax rate for the three and nine months ended September 30, 2019 was lower than the expected statutory tax rate of 21%, primarily as a result of the reversal of previously recorded reserves for uncertain tax positions due to the lapse of the statute of limitations for certain years in certain jurisdictions.