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Long-Term Debt and Credit Facility (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Components of long-term debt
Long-term debt is as follows (in thousands): 
 
December 31,
 
2017
 
2016
Long-term debt:
 
 
 
Borrowings under revolving credit facility
$
27,950

 
$
38,566

Term loan
—

 
9,833

Total long-term debt
27,950

 
48,399

     Less current portion of long-term debt
(27,950
)
 
(40,566
)
Long-term debt, less current portion
$
—

 
$
7,833