Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 8,613	$ 8,250	$ 9,183
Charged to cost and expenses	219	672	184
Write-offs (recoveries) of doubtful accounts	911	309	1,117
Balance at end of period	7,921	8,613	8,250
Student Loan [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	19,361	21,026	15,682
Charged to cost and expenses	19,834	17,858	15,917
Write-offs (recoveries) of doubtful accounts	17,878	19,523	10,573
Balance at end of period	$ 21,317	$ 19,361	$ 21,026