Business Segments (Restructuring) (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Severance			$ 1,224
Operating lease cost			9,156
Accelerated depreciation of property, plant and equipment			3,368
Total Restructuring Costs Include in Segment Income (Loss) from Operations			13,748
Lease right-of-use assets			9,455
Property, plant and equipment			2,056
Non-operating pensions and postretirement benefit income, net			6,014
Total Restructuring Related Costs	$ 29,200		31,273
Operating Segments [Member] | Education [Member]
Restructuring Cost and Reserve [Line Items]
Severance			1,224
Operating lease cost			9,156
Accelerated depreciation of property, plant and equipment			3,368
Total Restructuring Costs Include in Segment Income (Loss) from Operations			13,748
Lease right-of-use assets			8,050
Property, plant and equipment			1,970
Non-operating pensions and postretirement benefit income, net			5,015
Total Restructuring Related Costs			28,783
Operating Segments [Member] | Education [Member] | Kaplan Corporate and Other [Member]
Restructuring Cost and Reserve [Line Items]
Severance			0
Accelerated depreciation of property, plant and equipment			0
Total Restructuring Costs Include in Segment Income (Loss) from Operations			0
Lease right-of-use assets			0
Property, plant and equipment			0
Non-operating pensions and postretirement benefit income, net			189
Total Restructuring Related Costs			189
Operating Segments [Member] | Education [Member] | Kaplan International [Member] | Reportable Subsegments [Member]
Restructuring Cost and Reserve [Line Items]
Severance			1,224
Operating lease cost			2,418
Accelerated depreciation of property, plant and equipment			1,472
Total Restructuring Costs Include in Segment Income (Loss) from Operations			5,114
Lease right-of-use assets			3,790
Property, plant and equipment			1,199
Non-operating pensions and postretirement benefit income, net			1,100
Total Restructuring Related Costs			11,203
Operating Segments [Member] | Education [Member] | Higher Education [Member] | Reportable Subsegments [Member]
Restructuring Cost and Reserve [Line Items]
Severance			0
Operating lease cost		$ 2,000	3,442
Accelerated depreciation of property, plant and equipment			95
Total Restructuring Costs Include in Segment Income (Loss) from Operations			3,537
Lease right-of-use assets			2,062
Property, plant and equipment			174
Non-operating pensions and postretirement benefit income, net			1,431
Total Restructuring Related Costs			7,204
Operating Segments [Member] | Education [Member] | Test Preparation [Member] | Reportable Subsegments [Member]
Restructuring Cost and Reserve [Line Items]
Severance			0
Operating lease cost			2,740
Accelerated depreciation of property, plant and equipment			1,792
Total Restructuring Costs Include in Segment Income (Loss) from Operations			4,532
Lease right-of-use assets			243
Property, plant and equipment			0
Non-operating pensions and postretirement benefit income, net			0
Total Restructuring Related Costs			4,775
Operating Segments [Member] | Education [Member] | Professional (U.S.) [Member] | Reportable Subsegments [Member]
Restructuring Cost and Reserve [Line Items]
Severance			0
Operating lease cost			556
Accelerated depreciation of property, plant and equipment			9
Total Restructuring Costs Include in Segment Income (Loss) from Operations			565
Lease right-of-use assets			1,955
Property, plant and equipment			597
Non-operating pensions and postretirement benefit income, net			2,295
Total Restructuring Related Costs			5,412
Operating Segments [Member] | SocialCode [Member]
Restructuring Cost and Reserve [Line Items]
Severance			0
Accelerated depreciation of property, plant and equipment			0
Total Restructuring Costs Include in Segment Income (Loss) from Operations			0
Lease right-of-use assets			1,405
Property, plant and equipment			86
Non-operating pensions and postretirement benefit income, net			999
Total Restructuring Related Costs			$ 2,490