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Income Taxes Income Taxes (Policies)
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Income Tax, Policy [Policy Text Block]
The Partnership’s effective tax rate differs from the statutory rate primarily due to partnership earnings that are not subject to United States federal and most state income taxes at the partnership level. For the three months ended March 31, 2019, the Partnership’s effective tax rate was primarily driven by an increase in income before tax expense (benefit) at our corporate subsidiaries.