Guarantor Subsidiaries Financial Information (Narrative) (Details) - USD ($)	Dec. 31, 2019	Sep. 30, 2019	Jul. 31, 2018	Dec. 31, 2017	Nov. 30, 2017
Loans Payable | Term Loan B
Condensed Financial Statements, Captions [Line Items]
Debt instrument face value	$ 275,000,000
Loans Payable | Term Loan A
Condensed Financial Statements, Captions [Line Items]
Debt instrument face value	100,000,000
Senior Notes | Senior Secured Second Lien Notes due 2025
Condensed Financial Statements, Captions [Line Items]
Debt instrument face value	$ 300,000,000				$ 300,000,000
Stated interest rate	11.00%	11.00%	11.00%	11.00%	11.00%