CONCENTRATIONS AND CREDIT RISK

12 Months Ended

Dec. 31, 2014

CONCENTRATIONS AND CREDIT RISK

CONCENTRATIONS AND CREDIT RISK

NOTE 7. CONCENTRATIONS AND CREDIT RISK

Major Customers

Revenue from a single customer accounted for approximately 10% of total revenue for the year ended December 31, 2014. No customer accounted for more than 10% of total revenue for the years ended December 31, 2013 or 2012.

No customer accounted for more than 10% of total trade receivables as of December 31, 2014. Receivables from a single customer accounted for approximately 16% of total trade receivables as of December 31, 2013.

Credit Risk Concentration

We maintain most of our cash and cash equivalents with nationally recognized financial institutions like Wells Fargo Bank, National Association ("Wells Fargo") and Comerica, Inc. Substantially all balances are uninsured and are not used as collateral for other obligations. Concentrations of credit risk on accounts receivable are believed to be limited due to the number, diversification and character of the obligors and our credit evaluation process.

Labor Concentrations

As of December 31, 2014, 11 employees at our Richland, Washington facility were represented by the Paper, Allied-Industrial Chemical & Energy Workers International Union, AFL-CIO, CLC (PACE); 104 employees at our Blainville, Québec, Canada facility were represented by the Communications, Energy and Paperworkers Union of Canada; and 296 employees of the acquired EQ workforce were represented by the Local 324 Operating Engineers Union. As of December 31, 2014, our 1,401 other employees did not belong to a union.