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 ($)	Jun. 30, 2020 USD ($) Segment
Business Segments [Line Items]
Number of reportable segments | Segment				8
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
SocialCode [Member] | Operating Segments [Member]
Business Segments [Line Items]
Restructuring, Settlement and Impairment Provisions				2,490
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
Test Preparation [Member] | Reportable Subsegments [Member] | Education [Member] | Operating Segments [Member]
Business Segments [Line Items]
Restructuring, Settlement and Impairment Provisions				4,775
Operating lease cost				$ 2,740