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Allowance for Doubtful Accounts (Tables) | 9 Months Ended
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Sep. 30, 2019
Allowance for Doubtful Accounts |
Schedule of Allowance for Doubtful Accounts | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at |  | ​ |  | ​ |  | ​ |  | Balance at
​ | ​ | Beginning of | ​ | Charged to | ​ | Deductions/ | ​ | ​ | ​ | End of
​ | ​ | Period | ​ | Expense | ​ | Transfers(1)(2) | ​ | Transfers(2) | ​ | Period
Allowance for doubtful accounts receivable | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine months ended September 30, 2019 | ​ | $ | — |  | — |  | — |  | — | ​ | $ | —
Nine months ended September 30, 2018 | ​ | $ | 5,907 |  | 8,669 |  | (8,483) |  | (6,093) | ​ | $ | —
(1) | Deductions represent accounts written off, net of recoveries.
(2) | Allowance was transferred to GCU with other educational assets and liabilities on July 1, 2018. See Note 2.

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