Annual report pursuant to Section 13 and 15(d)

Long-Term Debt (Aggregate maturities of long-term debt and revolving lines of credit) (Details)

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Long-Term Debt (Aggregate maturities of long-term debt and revolving lines of credit) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Long-Term Debt [Abstract]    
2022 $ 20,842  
Thereafter  
Total future long-term debt payments 20,842  
Unamortized discount (814) $ (814)
Total carrying amount of long-term debt 20,842 21,898
Less current portion   $ (21,898)
Long-term debt obligations $ 20,842