Business Segments (Restructuring Costs) (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Severance			$ 6,163
Operating Lease Cost			9,942
Accelerated depreciation of property, plant and equipment			3,573
Total Restructuring Costs Included in Segment Results	[1]		19,678
Lease right-of-use assets		$ 3,900	11,448
Property, plant and equipment		$ 2,400	2,321
Non-operating pension and postretirement benefit income, net			13,781
Total Restructuring Related Costs			47,228
Operating Segments [Member] | Education [Member]
Restructuring Cost and Reserve [Line Items]
Severance			6,163
Operating Lease Cost			9,942
Accelerated depreciation of property, plant and equipment			3,573
Total Restructuring Costs Included in Segment Results	[1]		19,678
Lease right-of-use assets			10,043
Property, plant and equipment			2,235
Non-operating pension and postretirement benefit income, net			12,782
Total Restructuring Related Costs			44,738
Operating Segments [Member] | Education [Member] | Kaplan Corporate and Other [Member]
Restructuring Cost and Reserve [Line Items]
Severance			0
Operating Lease Cost			0
Accelerated depreciation of property, plant and equipment			0
Total Restructuring Costs Included in Segment Results	[1]		0
Lease right-of-use assets			0
Property, plant and equipment			0
Non-operating pension and postretirement benefit income, net			883
Total Restructuring Related Costs			883
Operating Segments [Member] | Education [Member] | Kaplan International [Member] | Reportable Subsegments [Member]
Restructuring Cost and Reserve [Line Items]
Severance			4,366
Operating Lease Cost			2,905
Accelerated depreciation of property, plant and equipment			1,620
Total Restructuring Costs Included in Segment Results	[1]		8,891
Lease right-of-use assets			3,976
Property, plant and equipment			1,248
Non-operating pension and postretirement benefit income, net			1,100
Total Restructuring Related Costs			15,215
Operating Segments [Member] | Education [Member] | Higher Education [Member] | Reportable Subsegments [Member]
Restructuring Cost and Reserve [Line Items]
Severance			0
Operating Lease Cost			3,451
Accelerated depreciation of property, plant and equipment			152
Total Restructuring Costs Included in Segment Results	[1]		3,603
Lease right-of-use assets			2,062
Property, plant and equipment			174
Non-operating pension and postretirement benefit income, net			2,233
Total Restructuring Related Costs			8,072
Operating Segments [Member] | Education [Member] | Supplemental Education [Member] | Reportable Subsegments [Member]
Restructuring Cost and Reserve [Line Items]
Severance			1,797
Operating Lease Cost			3,586
Accelerated depreciation of property, plant and equipment			1,801
Total Restructuring Costs Included in Segment Results	[1]		7,184
Lease right-of-use assets			4,005
Property, plant and equipment			813
Non-operating pension and postretirement benefit income, net			8,566
Total Restructuring Related Costs			20,568
Operating Segments [Member] | Other Businesses [Member]
Restructuring Cost and Reserve [Line Items]
Severance			0
Operating Lease Cost			0
Accelerated depreciation of property, plant and equipment			0
Total Restructuring Costs Included in Segment Results	[1]		0
Lease right-of-use assets			1,405
Property, plant and equipment			86
Non-operating pension and postretirement benefit income, net			999
Total Restructuring Related Costs			$ 2,490

[1] These amounts are included in the segments’ Income (Loss) from Operations before Amortization of Intangible Assets and Impairment of Goodwill and Other Long-Lived Assets.