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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Apr. 05, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 778,951 | $ 778,951 |  | $ 615,433 | $ 615,438
Community Education Centers |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Accounts Receivable |  | 32,869 | 32,869 | $ 29,936 |  |
Prepaid and other current assets |  | 4,397 | 4,397 | 5,032 |  |
Property and equipment |  | 126,510 | 126,510 | 126,510 |  |
Intangible assets |  | 76,000 | 76,000 | 76,000 |  |
Favorable lease assets |  | 3,110 | 3,110 | 3,110 |  |
Deferred income tax assets |  | 4,116 | 4,116 | 2,223 |  |
Other non-current assets |  | 4,327 | 4,327 | 4,327 |  |
Total assets acquired |  | 251,329 | 251,329 | 247,138 |  |
Accounts payable and accrued expenses |  | 51,651 | 51,651 | 53,800 |  |
Unfavorable lease liabilities |  | 1,299 | 1,299 | 1,299 |  |
Other non-current liabilities |  | 10,479 | 10,479 | 9,917 |  |
Total liabilities assumed |  | 63,429 | 63,429 | 65,016 |  |
Total identifiable net assets |  | 187,900 | 187,900 | 182,122 |  |
Goodwill |  | 165,656 | 165,656 | 172,343 |  |
Total consideration paid, net of cash acquired |  | 353,556 | 353,556 | $ 354,465 |  |
Measurement Period Adjustments |  |  |  |  |  |
Accounts Receivable |  |  | 2,933 |  |  |
Prepaid and other current assets |  |  | (635) |  |  |
Deferred income tax assets |  |  | 1,893 |  |  |
Total assets acquired |  |  | 4,191 |  |  |
Accounts payable and accrued expenses |  |  | (2,149) |  |  |
Other non-current liabilities |  | $ 5,100 | 562 |  |  |
Total liabilities assumed |  |  | (1,587) |  |  |
Total liabilities assumed |  |  | 5,778 |  |  |
Goodwill |  |  | (6,687) |  |  |
Total consideration paid, net of cash acquired | $ 2,600 |  | $ (909) |  |  |

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