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Long-Term Debt - Face Value to Carrying Value Reconciliation (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Feb. 17, 2016
Jul. 03, 2013
Aug. 19, 2010
Senior Notes | 10% Senior Unsecured Notes Due 2017          
Debt Instrument [Line Items]          
Principal amount       $ 200,000,000 $ 150,000,000
Long-term debt     $ 135,600,000    
Term Loan | Line of Credit          
Debt Instrument [Line Items]          
Unamortized deferred finance costs $ (300,000) $ (2,000,000)