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CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	3 Months Ended
CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	Mar. 31, 2018
Defined Contribution Plan [Abstract]
CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	CONTRIBUTING EMPLOYEE OWNERSHIP PLAN The Contributing Employee Ownership Plan (CEOP) is a defined contribution plan available to essentially all domestic employees. We provide a contribution to an individual retirement contribution account maintained with the CEOP equal to an amount of between 5.0% and 7.5% of the employee’s eligible compensation. The defined contribution plan expense for the three months ended March 31, 2018 and 2017 was $8.6 million and $8.7 million, respectively. Company matching contributions are invested in the same investment allocation as the employee’s contribution. Our matching contributions for eligible employees for the three months ended March 31, 2018 and 2017 was $3.7 million and $2.9 million, respectively.