XML 61 R50.htm IDEA: XBRL DOCUMENT v3.19.1
ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Accounts receivable $ 299,185 $ 245,236
Allowance for doubtful accounts 3,852 3,404
Accounts receivable, net $ 295,333 $ 241,832