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14. RELATED PARTY TRANSACTIONS
12 Months Ended
Dec. 31, 2015
Related Party Transactions [Abstract]  
RELATED PARTY TRANSACTIONS

We use World Wide Express, a package delivery company owned by our western operations chief operating officer, to provide delivery services for us. For the years ended December 31, 2015, 2014 and 2013, we paid approximately $693,000, $833,000, $955,000, and respectively, to World Wide Express for those services. At December 31, 2015 and 2014, we had outstanding amounts due to World Wide Express of $116,000 and $61,000, respectively.