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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Operating Loss Carryforwards [Line Items]    
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions $ 4.5  
Minimum    
Operating Loss Carryforwards [Line Items]    
Open Tax Year   2015
Internal Revenue Service (IRS)    
Operating Loss Carryforwards [Line Items]    
Income Tax Examination, Year under Examination   2016
New York State Division of Taxation and Finance | Minimum    
Operating Loss Carryforwards [Line Items]    
Income Tax Examination, Year under Examination   2014