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Contingencies and Other Commitments (Details)
$ in Thousands, £ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
claim
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
GBP (£)
Loss Contingencies [Line Items]            
Number of existing legal claims or proceedings that are likely to have a material effect on the Company's business | claim     0      
Loss on Guarantor Lease Obligations     $ 1,014 $ 1,075 $ 17,518  
Maximum [Member]            
Loss Contingencies [Line Items]            
Loss contingency, estimate of possible loss     15,000      
Television Broadcasting [Member]            
Loss Contingencies [Line Items]            
Long-term Purchase Commitment, Amount     21,800      
Sale Of KHE Campuses Business [Member]            
Loss Contingencies [Line Items]            
Loss on Guarantor Lease Obligations   $ 17,500 $ 1,000 $ 1,100 $ 17,500  
Kaplan International [Member] | UK Pathways [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]            
Loss Contingencies [Line Items]            
Amount Paid Entitled To Recover | £           £ 18.6
Kaplan International [Member] | UK Pathways [Member] | Her Majesty's Revenue and Customs (HMRC) [Member] | 2014 to 2018 [Member]            
Loss Contingencies [Line Items]            
Loss Contingency, Loss in Period | £ £ 14.1