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Business Combinations - Intangible Assets Acquired (Details)
$ in Thousands
Apr. 05, 2017
USD ($)
Community Education Centers  
Business Acquisition [Line Items]  
Total acquired intangible assets $ 76,000
Facility management contracts  
Business Acquisition [Line Items]  
Weighted Average Useful Life (years) 17 years 12 months 100 days
Facility management contracts | Community Education Centers  
Business Acquisition [Line Items]  
Total acquired intangible assets $ 75,300
Covenants not to compete  
Business Acquisition [Line Items]  
Weighted Average Useful Life (years) 1 year
Covenants not to compete | Community Education Centers  
Business Acquisition [Line Items]  
Total acquired intangible assets $ 700