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Employee Savings Plan (Notes)
12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Compensation and Employee Benefit Plans [Text Block] Employee Savings PlanWe have an employee savings plan pursuant to Section 401(k) of the Internal Revenue Code. All employees are eligible to participate, provided they meet the requirements of the plan. We are not required to make matching contributions under the plan. However, we voluntarily contributed to the plan approximately $1.1 million, $2.2 million and $1.3 million for the years ended December 31, 2020, 2019 and 2018, respectively.