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Debt (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Other indebtedness $ 93 $ 96
Total Debt 509,806 477,137
Less: current portion (9,568) (6,360)
Total Long-Term Debt 500,238 470,777
5.75% Unsecured Notes due June 1, 2026 [Member]    
Debt Instrument [Line Items]    
Unsecured notes [1] 394,852 394,675
Unamortized debt issuance costs 5,100 5,300
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]    
Debt Instrument [Line Items]    
UK Credit Facility [2] 85,111 82,366
Unamortized debt issuance costs 200 200
Commercial note [Member]    
Debt Instrument [Line Items]    
Commercial note $ 29,750 $ 0
[1] The carrying value is net of $5.1 million and $5.3 million of unamortized debt issuance costs as of March 31, 2019 and December 31, 2018, respectively.
[2] The carrying value is net of $0.2 million of unamortized debt issuance costs as of March 31, 2019 and December 31, 2018, respectively.