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Savings Plan (Notes)	12 Months Ended
Savings Plan (Notes)	Dec. 31, 2017
Savings Plan [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	Savings Plan The Company’s employees participate in a defined contribution plan. Under the provisions of the plan, an employee is fully vested with respect to Company contributions after four years of service. The Company matches employee contributions of 100% up to a maximum of $6,000 of qualified compensation and may, at its discretion, make voluntary contributions. The Company's contributions were $1.0 million, $0.7 million, and $0.6 million for each of the years ended December 31, 2017, 2016, and 2015, respectively.