Acquisitions (Acquired Intangible Assets Subject to Amortization and Values and Estimated Useful Lives) (Details) - Walden University, LLC [Member] $ in Thousands	Aug. 12, 2021 USD ($)
Student Relationships [Member]
Business Acquisition [Line Items]
Intangible assets, finite lived	$ 161,900
Amortizable intangible assets, estimated useful lives	3 years
Curriculum [Member]
Business Acquisition [Line Items]
Intangible assets, finite lived	$ 56,091
Amortizable intangible assets, estimated useful lives	5 years