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Restructuring and Other Termination Costs	6 Months Ended
Restructuring and Other Termination Costs	Jun. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring and Other Termination Costs	Restructuring and Other Termination Costs On January 30, 2018, we underwent a reduction in workforce impacting approximately 13% of employees across all functions, primarily on our Oklahoma City campus. In connection with the reduction, we incurred a total charge in the Prior Period of approximately $38 million for one-time termination benefits.