MARKET RISKS AND CONCENTRATIONS	12 Months Ended
Dec. 31, 2017
Risks and Uncertainties [Abstract]
MARKET RISKS AND CONCENTRATIONS	MARKET RISKS AND CONCENTRATIONS The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash equivalents, investment securities and trade accounts receivable. The Company’s cash equivalents and investment securities are high-quality debt and equity securities placed with major banks and financial institutions. The Company’s trade accounts receivable are generally unsecured. Credit evaluations are performed on all significant customers and updated as circumstances dictate. Concentrations of credit risk with respect to trade accounts receivable are limited due to the large number of customers and their dispersion across geographic areas. With the exception of one customer that accounts for approximately 4.9% of trade accounts and other receivables at December 31, 2017, and approximately 5.9% of net sales for 2017, the Company does not believe it has significant concentrations of credit risk in its trade accounts receivable. As of December 31, 2017, we employed approximately 30,900 persons in the U.S., approximately 10,200 persons in Mexico and approximately 10,200 persons in the U.K. and Europe. Approximately 37.8% of the Company’s employees were covered under collective bargaining agreements. Substantially all employees covered under collective bargaining agreements are covered under agreements that expire in 2018 or later. We have not experienced any labor-related work stoppage at any location in over ten years. We believe our relationship with our employees and union leadership is satisfactory. At any given time, we will likely be in some stage of contract negotiations with various collective bargaining units. In the absence of an agreement, we may become subject to labor disruption at one or more of these locations, which could have an adverse effect on our financial results. At December 31, 2017, the aggregate carrying amount of net assets belonging to our Mexico and European operations was $711.2 million and $1,367.7 million, respectively. At December 25, 2016, the aggregate carrying amount of net assets belonging to our Mexico and European operations was $673.0 million and $1,232.8 million, respectively.

MARKET RISKS AND CONCENTRATIONS

The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash equivalents, investment securities and trade accounts receivable. The Company’s cash equivalents and investment securities are high-quality debt and equity securities placed with major banks and financial institutions. The Company’s trade accounts receivable are generally unsecured. Credit evaluations are performed on all significant customers and updated as circumstances dictate. Concentrations of credit risk with respect to trade accounts receivable are limited due to the large number of customers and their dispersion across geographic areas. With the exception of one customer that accounts for approximately 4.9% of trade accounts and other receivables at December 31, 2017, and approximately 5.9% of net sales for 2017, the Company does not believe it has significant concentrations of credit risk in its trade accounts receivable.

As of December 31, 2017, we employed approximately 30,900 persons in the U.S., approximately 10,200 persons in Mexico and approximately 10,200 persons in the U.K. and Europe. Approximately 37.8% of the Company’s employees were covered under collective bargaining agreements. Substantially all employees covered under collective bargaining agreements are covered under agreements that expire in 2018 or later. We have not experienced any labor-related work stoppage at any location in over ten years. We believe our relationship with our employees and union leadership is satisfactory. At any given time, we will likely be in some stage of contract negotiations with various collective bargaining units. In the absence of an agreement, we may become subject to labor disruption at one or more of these locations, which could have an adverse effect on our financial results.

At December 31, 2017, the aggregate carrying amount of net assets belonging to our Mexico and European operations was $711.2 million and $1,367.7 million, respectively. At December 25, 2016, the aggregate carrying amount of net assets belonging to our Mexico and European operations was $673.0 million and $1,232.8 million, respectively.