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Debt (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Other indebtedness $ 87 $ 96
Total Debt 502,232 477,137
Less: current portion (81,697) (6,360)
Total Long-Term Debt 420,535 470,777
Five-Year Credit Agreement dated May 30, 2018 [Member]    
Debt Instrument [Line Items]    
Credit facility 5,000 0
5.75% Unsecured Notes due June 1, 2026 [Member]    
Debt Instrument [Line Items]    
Unsecured notes [1] 395,212 394,675
Unamortized debt issuance costs 4,800 5,300
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]    
Debt Instrument [Line Items]    
Credit facility [2] 73,683 82,366
Unamortized debt issuance costs 100 200
Commercial note [Member]    
Debt Instrument [Line Items]    
Commercial note $ 28,250 $ 0
[1]
The carrying value is net of $4.8 million and $5.3 million of unamortized debt issuance costs as of September 30, 2019 and December 31, 2018, respectively.
[2]
The carrying value is net of $0.1 million and $0.2 million of unamortized debt issuance costs as of September 30, 2019 and December 31, 2018, respectively.