Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - February 2018 Term Loan (Details)

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Long-Term Debt - February 2018 Term Loan (Details) - USD ($)
$ in Thousands
1 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Long-term debt   $ 251,366 $ 202,168
Term Loan | 7.5% Term Loan      
Debt Instrument [Line Items]      
Long-term debt   $ 28,500  
Proceeds from issuance of debt $ 28,500    
Weighted average interest rate   9.2734%  
Term Loan | 7.5% Term Loan | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread on variable rate 7.50%    
Line of Credit      
Debt Instrument [Line Items]      
Long-term debt   $ 22,648