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Income Taxes - Narrative (Details)
 3 Months Ended
Mar. 31, 2019
Minimum  
Income Taxes  
Number of tax years open for state tax audit (in years) 3 years
Maximum  
Income Taxes  
Number of tax years open for state tax audit (in years) 5 years
Earliest Tax Year  
Income Taxes  
Open tax year 2005
Latest Tax Year  
Income Taxes  
Open tax year 2014
Domestic Tax Authority | Earliest Tax Year  
Income Taxes  
Open tax year 2015