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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
	Jun. 23, 2017	Mar. 31, 2019	Dec. 31, 2018	Sep. 19, 2017
Debt Instrument [Line Items]
Long-term debt		$ 199,160	$ 199,096
6.75% Senior Secured Notes [Member] | Senior Secured Notes
Debt Instrument [Line Items]
Private placement date	Jun. 23, 2017
Debt Instrument, Face Amount	$ 200,000
Interest rate	6.75%
Debt Issuance Costs, Gross	$ 4,300
Interest expense on note		3,400
Debt Instrument, Issue Price Percentage	100.00%
Percentage of Notes Registered under the Securities Act of 1933				99.80%
8.75% Senior Secured Notes [Member] | Senior Secured Notes
Debt Instrument [Line Items]
Interest rate	8.75%
Extinguishment of Debt, Amount	$ 120,000
Oppenheimer [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes
Debt Instrument [Line Items]
Debt Issuance Costs, Gross	3,000
Third Party [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes
Debt Instrument [Line Items]
Debt Issuance Costs, Gross	$ 1,300
Maximum [Member] | 6.75% Senior Secured Notes [Member]
Debt Instrument [Line Items]
Restrictive Covenants Exception for Dividend or Distribution Amount during fiscal year		20,000
Restrictive Covenants Exception for total Dividend Payment and other Restricted Payments		$ 10,000

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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