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Debt (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Other indebtedness $ 96 $ 109
Total Debt 477,137 493,287
Less: current portion (6,360) (6,726)
Total Long-Term Debt 470,777 486,561
5.75% Unsecured Notes due June 1, 2026 [Member]    
Debt Instrument [Line Items]    
Unsecured notes [1] 394,675 0
Unamortized debt issuance costs 5,300  
7.25% Unsecured Notes due February 1, 2019 [Member]    
Debt Instrument [Line Items]    
Unsecured notes 0 399,507
Kaplan Four Year Credit Agreement Dated July 14, 2016 [Member]    
Debt Instrument [Line Items]    
Line of Credit [2] 82,366 93,671
Unamortized debt issuance costs $ 200 $ 400
[1] The carrying value is net of $5.3 million of unamortized debt issuance costs as of December 31, 2018.
[2] The carrying value is net of $0.2 million and $0.4 million of unamortized debt issuance costs as of December 31, 2018 and 2017, respectively.