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Income Taxes - Carryforwards (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Alternative minimum tax credit  
Net operating loss carryforward  
Alternative minimum tax credit that can be carried forward $ 2.6
Federal  
Net operating loss carryforward  
Net operating loss carryforward 7.6
State  
Net operating loss carryforward  
Net operating loss carryforward 39.9
State | 2025  
Net operating loss carryforward  
Net operating loss carryforward $ 39.7