Business Segments (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 segment	Jun. 30, 2020 USD ($)
Business Segments [Line Items]
Number of reportable segments | segment				6
Restructuring, Settlement and Impairment Provisions		$ 29,200			$ 31,273
Operating lease cost					9,156
Clyde's Restaurant Group [Member]
Business Segments [Line Items]
Accelerated Depreciation	$ 2,800
Education [Member] | Operating Segments [Member]
Business Segments [Line Items]
Restructuring, Settlement and Impairment Provisions					28,783
Operating lease cost					9,156
Other Businesses [Member] | Operating Segments [Member]
Business Segments [Line Items]
Restructuring, Settlement and Impairment Provisions					2,490
Operating lease cost					0
Kaplan International [Member] | Reportable Subsegments [Member] | Education [Member] | Operating Segments [Member]
Business Segments [Line Items]
Restructuring, Settlement and Impairment Provisions					11,203
Operating lease cost					2,418
Higher Education [Member] | Reportable Subsegments [Member] | Education [Member] | Operating Segments [Member]
Business Segments [Line Items]
Restructuring, Settlement and Impairment Provisions					7,204
Operating lease cost			$ 2,000		$ 3,442