Quarterly report pursuant to Section 13 or 15(d)

RECENT ACCOUNTING PRONOUNCEMENTS - Receivables and Allowance for Doubtful Accounts (Details)

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RECENT ACCOUNTING PRONOUNCEMENTS - Receivables and Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable, Net [Roll Forward]    
Balance at December 31, 2017 $ 14,706  
Charged to costs and expenses 4,190 $ 2,564
Net (deductions) recoveries (4,866)  
Balance at June 30, 2018 $ 14,030