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The Transaction - Summary of Disposed Assets, previously Assets and Liabilities Held for Sale Transferred to GCU - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Jul. 01, 2018
Mar. 31, 2018
Dec. 31, 2017
The Transaction          
Allowance for doubtful accounts $ 0     $ 7,182 $ 5,907
Accumulated depreciation on property and equipment $ 84,194 $ 89,689      
Assets Held for Sale          
The Transaction          
Allowance for doubtful accounts     $ 6,093    
Accumulated depreciation on property and equipment     $ 166,066