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Student Receivables (Tables) | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Changes in Current and Non-Current Receivables Allowance | Changes in our current and non-current receivables allowance for the years ended December 31, 2017, 2016 and 2015 were as follows (dollars in thousands):
|  | Balance, Beginning of Period |  |  | Charges to Expense (1) |  |  | Amounts Written-off |  |  | Balance, End of Period |
For the year ended December 31, 2017 |  | $ | 23,142 |  |  | $ | 27,571 |  |  | $ | (28,179 | ) |  | $ | 22,534 |
For the year ended December 31, 2016 |  | $ | 20,229 |  |  | $ | 32,049 |  |  | $ | (29,136 | ) |  | $ | 23,142 |
For the year ended December 31, 2015 |  | $ | 19,097 |  |  | $ | 22,212 |  |  | $ | (21,080 | ) |  | $ | 20,229 |
(1) | Charges to expense include an offset for recoveries of amounts previously written off of $4.2 million, $6.2 million and $6.7 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition Tabular disclosure related to the reconciliation of changes in the allowance for doubtful accounts, including disclosures for bad debt expense and amounts written off. + References No definition available. + Details
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