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Debt (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Other indebtedness $ 3,503 $ 83
Total Debt 515,386 512,829
Less: current portion (6,104) (82,179)
Total Long-Term Debt 509,282 430,650
5.75% Unsecured Notes due June 1, 2026 [Member]    
Debt Instrument [Line Items]    
Unsecured notes [1] $ 395,931 $ 395,393
Interest rate 5.75% 5.75%
Unamortized debt issuance costs $ 4,100 $ 4,600
Five-Year Credit Agreement dated May 30, 2018 [Member]    
Debt Instrument [Line Items]    
Credit facility 77,156 0
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]    
Debt Instrument [Line Items]    
Credit facility [2] 0 78,650
Unamortized debt issuance costs   100
Commercial note with Truist Bank [Member]    
Debt Instrument [Line Items]    
Commercial note 26,000 27,500
Pinnacle Bank Term Loan [Member]    
Debt Instrument [Line Items]    
Loans Payable to Bank 10,837 11,203
Pinnacle Bank Line Of Credit [Member]    
Debt Instrument [Line Items]    
Credit facility $ 1,959 $ 0
[1] The carrying value is net of $4.1 million and $4.6 million of unamortized debt issuance costs as of September 30, 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.