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Business Combinations - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 05, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition of CEC, net of cash acquired |  |  | $ 0 | $ 353,556 | $ 0 |
Goodwill |  |  | $ 776,359 | 778,951 | $ 615,433 |
Community Education Centers |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |  |
Acquisition of CEC, net of cash acquired | $ 353,600 |  |  |  |  |
Operating expenses |  | $ 2,300 |  |  |  |
Goodwill |  |  |  | $ 165,656 |  | $ 163,107

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