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Contingencies and Regulatory Matters (Details)
$ in Thousands, £ in Millions
6 Months Ended
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
claim
program_review
Jun. 30, 2019
GBP (£)
claim
program_review
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 0
Deferred Charges and Other Assets $ 117,830 $ 142,146  
Maximum [Member]      
Loss Contingencies [Line Items]      
Loss contingency, estimate of possible loss   $ 45,000  
Sale of KHE Campuses business [Member]      
Loss Contingencies [Line Items]      
Loss on Guarantor Lease Obligations $ 17,500    
Education [Member] | Sale of KHE Campuses business [Member] | Higher Education [Member]      
Loss Contingencies [Line Items]      
Number of pending program reviews | program_review   2 2
Her Majesty's Revenue and Customs (HMRC) [Member] | UK Pathways [Member] | Kaplan International [Member]      
Loss Contingencies [Line Items]      
Loss contingency, estimate of possible loss | £     £ 16.8
Deferred Charges and Other Assets | £     £ 16.8