XML 28 R13.htm IDEA: XBRL DOCUMENT v3.10.0.1
ACCOUNTS RECEIVABLE
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
ACCOUNTS RECEIVABLE
ACCOUNTS RECEIVABLE
We had no allowances for doubtful accounts at December 31, 2018 and 2017. In addition, we had no bad debt expense for the years ended December 31, 2018, 2017 and 2016 in our consolidated statements of income.