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Long-Term Debt and Credit Facility (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Components of long-term debt
Long-term debt is as follows (in thousands):
 
June 30, 2018
 
December 31, 2017
Long-term debt, classified as current:
 
 
 
Borrowings under revolving credit facility
$
49,126

 
$
27,950