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Debt (Details 1)
$ in Thousands
Mar. 31, 2021
USD ($)
Mar. 31, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Other indebtedness $ 3,435   $ 3,520
Total Debt 510,329   512,555
Less: current portion (4,238)   (6,452)
Total Long-Term Debt 506,091   506,103
5.75% Unsecured Notes due June 1, 2026 [Member]      
Debt Instrument [Line Items]      
Unsecured notes [1] 396,289   396,112
Unamortized debt issuance costs $ 3,700   $ 3,900
Interest rate 5.75% 5.75% 5.75%
Five-Year Credit Agreement dated May 30, 2018 [Member]      
Debt Instrument [Line Items]      
Credit facility $ 75,621 £ 55,000,000 $ 74,686
Commercial note with Truist Bank [Member]      
Debt Instrument [Line Items]      
Commercial note 24,500   25,250
Pinnacle Bank Term Loan [Member]      
Debt Instrument [Line Items]      
Loans Payable to Bank 10,411   10,692
Pinnacle Bank Line Of Credit [Member]      
Debt Instrument [Line Items]      
Credit facility $ 73   $ 2,295
[1] The carrying value is net of $3.7 million and $3.9 million of unamortized debt issuance costs as of March 31, 2021 and December 31, 2020, respectively.