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Debt (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Other indebtedness $ 90 $ 96
Total Debt 506,445 477,137
Less: current portion (9,351) (6,360)
Total Long-Term Debt 497,094 470,777
5.75% Unsecured Notes due June 1, 2026 [Member]    
Debt Instrument [Line Items]    
Unsecured notes [1] 395,031 394,675
Unamortized debt issuance costs 5,000 5,300
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]    
Debt Instrument [Line Items]    
UK Credit Facility [2] 82,324 82,366
Unamortized debt issuance costs 200 200
Commercial note [Member]    
Debt Instrument [Line Items]    
Commercial note $ 29,000 $ 0
[1]
The carrying value is net of $5.0 million and $5.3 million of unamortized debt issuance costs as of June 30, 2019 and December 31, 2018, respectively.
[2]
The carrying value is net of $0.2 million of unamortized debt issuance costs as of June 30, 2019 and December 31, 2018, respectively.