Debt (Details 1) $ in Thousands		Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 25, 2016 GBP (£)
Debt Instrument [Line Items]
Other indebtedness		$ 112	$ 1,479
Total Debt		492,955	491,847
Less: current portion		(6,713)	(6,128)
Total Long-Term Debt		486,242	485,719
7.25% Unsecured Notes due February 1, 2019 [Member]
Debt Instrument [Line Items]
Unsecured notes	[1]	399,393	399,052
Unamortized debt issuance costs		100	100
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]
Debt Instrument [Line Items]
UK Credit Facility	[2]	93,450	91,316
Unamortized debt issuance costs		$ 400	$ 500
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]
Debt Instrument [Line Items]
UK Credit Facility | £				£ 75,000,000

[1] The carrying value is net of $0.1 million of unamortized debt issuance costs as of September 30, 2017 and December 31, 2016, respectively.

[2] The carrying value is net of $0.4 million and $0.5 million of unamortized debt issuance costs as of September 30, 2017 and December 31, 2016, respectively.