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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 05, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 776,359 | $ 778,951 |  | $ 615,433
Community Education Centers |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Accounts Receivable | $ 32,869 |  | 32,869 |  |
Prepaid and other current assets | 4,397 |  | 4,397 |  |
Property and equipment | 126,510 |  | 126,510 |  |
Intangible assets | 76,000 |  | 76,000 | $ 76,000 |
Favorable lease assets | 3,110 |  | 3,110 |  |
Deferred income tax assets | 4,160 |  | 4,116 |  |
Other non-current assets | 4,327 |  | 4,327 |  |
Total assets acquired | 251,373 |  | 251,329 |  |
Accounts payable and accrued expenses | 50,312 |  | 51,651 |  |
Unfavorable lease liabilities | 1,299 |  | 1,299 |  |
Other non-current liabilities | 9,313 |  | 10,479 |  |
Total liabilities assumed | 60,924 |  | 63,429 |  |
Total identifiable net assets | 190,449 |  | 187,900 |  |
Goodwill | 163,107 |  | 165,656 |  |
Total consideration paid, net of cash acquired | 353,556 |  | $ 353,556 |  |
Measurement Period Adjustments |  |  |  |  |
Accounts Receivable | 0 |  |  |  |
Prepaid and other current assets | 0 |  |  |  |
Deferred income tax assets | 44 |  |  |  |
Total assets acquired | 44 |  |  |  |
Accounts payable and accrued expenses | (1,339) |  |  |  |
Other non-current liabilities | (1,166) |  |  |  |
Total liabilities assumed | (2,505) |  |  |  |
Total liabilities assumed | 2,549 |  |  |  |
Goodwill | (2,549) |  |  |  |
Total consideration paid, net of cash acquired | $ 0 |  |  |  |

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