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Debt (Long-term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 47,929 $ 23,866
Less current maturities (2,190) (1,500)
Total long-term debt 45,739 22,366
Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt 47,929 23,366
Note discount $ 1,113 $ 759
Imputed interest rate (as a percent) 6.60% 6.60%
Seller Notes Due 2016 [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 500