XML 61 R50.htm IDEA: XBRL DOCUMENT v3.8.0.1
ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Accounts receivable $ 297,106 $ 229,677
Allowance for doubtful accounts 2,601 2,974
Accounts receivable, net $ 294,505 $ 226,703