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Debt (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Other indebtedness $ 603 $ 83
Total Debt 508,892 512,829
Less: current portion (78,575) (82,179)
Total Long-Term Debt 430,317 430,650
5.75% Unsecured Notes due June 1, 2026 [Member]    
Debt Instrument [Line Items]    
Unsecured notes [1] 395,572 395,393
Unamortized debt issuance costs 4,400 4,600
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]    
Debt Instrument [Line Items]    
Credit facility [2] 74,358 78,650
Unamortized debt issuance costs   100
Commercial note [Member]    
Debt Instrument [Line Items]    
Commercial note 26,750 27,500
Pinnacle Bank Term Loan [Member]    
Debt Instrument [Line Items]    
Loans Payable to Bank 11,109 11,203
Pinnacle Bank Line Of Credit [Member]    
Debt Instrument [Line Items]    
Credit facility $ 500 $ 0
[1]
The carrying value is net of $4.4 million and $4.6 million of unamortized debt issuance costs as of March 31, 2020 and December 31, 2019, respectively.
[2]
The carrying value is net of $0.1 million of unamortized debt issuance costs as of December 31, 2019.