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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	EMPLOYEE BENEFIT PLAN Defined Contribution Plan The Company sponsors a qualified defined contribution benefit plan (the “Plan”), covering substantially all of its U.S. employees. The Plan includes a savings plan feature under Section 401(k) of the Internal Revenue Code. The Company makes matching contributions to the plans equal to 100% of the first 3%, and up to 50% of the next 2% of salary contributed by an eligible employee. Participants are vested 100% in the Company’s matching contributions when made. Contributions made by the Company under the Plan were $5.5 million, $5.8 million and $6.0 million for the years ended December 31, 2017, 2016, and 2015, respectively.