Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]        
Impairment charge     $ 0 $ 0
Jeffersonville [Member]        
Property, Plant and Equipment [Line Items]        
Impairment charge $ 49,700,000 $ 47,900,000