Annual report pursuant to Section 13 and 15(d)

Severance Expense CEO Severance (Details)

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Severance Expense CEO Severance (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Selling, general and administrative expenses        
Severance [Line Items]        
Severance expenses $ 2.4 $ 3.1 $ 4.6 $ 2.9