Stock, Unit and Debt Repurchases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jul. 31, 2019	May 31, 2019	Jul. 31, 2018	Nov. 30, 2017
Class of Stock [Line Items]
Aggregate authorized amount			$ 50,000,000
Stock and debt repurchase authorized amount							$ 100,000,000
Shares repurchased and retired	1,717,497	708,245	0
Average share price (in dollars per share)	$ 19.06	$ 36.48
Shares repurchased	26,297	167,958
Senior Secured Second Lien Notes due 2025
Class of Stock [Line Items]
Repayments of debt	$ 52,648,000	$ 25,724,000	$ 0
Senior Secured Second Lien Notes due 2025 | Senior Notes
Class of Stock [Line Items]
Stated interest rate	11.00%		11.00%	11.00%			11.00%	11.00%
Repayments of debt	$ 52,648,000	$ 25,724,000
CCR Units
Class of Stock [Line Items]
Stock and debt repurchase additional amount authorized						$ 50,000,000	$ 25,000,000
Average share price (in dollars per share)	$ 14.05	$ 18.33
Shares repurchased	26,297	167,958
CCR
Class of Stock [Line Items]
Stock and debt repurchase authorized amount					$ 200,000,000	175,000,000
Stock and debt repurchase additional amount authorized					$ 25,000,000	75,000,000
Stock and debt repurchase restricted authorized amount						$ 50,000,000