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Debt (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Other indebtedness $ 106 $ 109
Total Debt 497,733 493,287
Less: current portion (406,654) (6,726)
Total Long-Term Debt 91,079 486,561
7.25% Unsecured Notes due February 1, 2019 [Member]    
Debt Instrument [Line Items]    
Unsecured notes 399,621 399,507
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]    
Debt Instrument [Line Items]    
UK Credit Facility [1] $ 98,006 $ 93,671
[1] The carrying value is net of $0.4 million of unamortized debt issuance costs as of March 31, 2018 and December 31, 2017, respectively.