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Allowance for Doubtful Accounts | 9 Months Ended
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Sep. 30, 2018
Receivables [Abstract] |
Allowance for Doubtful Accounts | 6. Allowance for Doubtful Accounts
|  | Balance at Beginning of Period |  |  | Charged to Expense |  |  | Deductions(1) |  |  | Transfers(2) |  |  | Balance at End of Period |
Nine months ended September 30, 2018(2) |  | $ | 5,907 |  |  |  | 8,669 |  |  |  | (8,483 | ) |  |  | (6,093 | ) |  | $ | 0 |
Nine months ended September 30, 2017 |  | $ | 5,918 |  |  |  | 13,351 |  |  |  | (12,978 | ) |  |  | — |  |  | $ | 6,291 |
(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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- Definition The entire disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
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