Quarterly report pursuant to Section 13 or 15(d)

Debt and Credit Arrangements - Schedule of Long-term debt (Details)

v3.10.0.1
Debt and Credit Arrangements - Schedule of Long-term debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Revolving credit facility $ 84,426 $ 154,283
Debt issuance costs (574) (717)
Less: current portion of long-term debt 30,000 0
Total long-term debt 84,426 154,283
Revolving credit facility | Line of Credit    
Debt Instrument [Line Items]    
Revolving credit facility $ 115,000 $ 155,000