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Debt (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Other indebtedness $ 4,149 $ 3,520
Total Debt 555,889 512,555
Less: current portion (44,254) (6,452)
Total Long-Term Debt 511,635 506,103
5.75% Unsecured Notes due June 1, 2026 [Member]    
Debt Instrument [Line Items]    
Unsecured notes [1] 396,649 396,112
Unamortized debt issuance costs $ 3,400 $ 3,900
Interest rate 5.75% 5.75%
Five-Year Credit Agreement dated May 30, 2018 [Member]    
Debt Instrument [Line Items]    
Credit facility $ 122,251 $ 74,686
Commercial note with Truist Bank [Member]    
Debt Instrument [Line Items]    
Commercial note 23,000 25,250
Pinnacle Bank Term Loan [Member]    
Debt Instrument [Line Items]    
Loans Payable to Bank 9,840 10,692
Pinnacle Bank Line Of Credit [Member]    
Debt Instrument [Line Items]    
Credit facility $ 0 $ 2,295
[1] The carrying value is net of $3.4 million and $3.9 million of unamortized debt issuance costs as of September 30, 2021 and December 31, 2020, respectively.