Employee Benefit Plan Employee Benefit Plan (Notes)

12 Months Ended

Dec. 31, 2015

Postemployment Benefits [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

Employee Benefit Plan

The Company sponsors a defined contribution 401(k) plan (Plan) in which substantially all U.S. employees are eligible to participate. The Company currently matches 100 percent of each participant’s pre-tax contributions in an amount not exceeding 4 percent of the participant's compensation and 50 percent of each participant’s pre-tax contributions in an amount not exceeding 2 percent of the participant's compensation, up to the maximum amount of contributions allowed by law. The costs of our matching contributions to the Plan were $4.0 million, $4.7 million and $3.6 million in 2015, 2014 and 2013, respectively. Employees become 100 percent vested in the employer match contributions immediately upon participation in the Plan.