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Debt and Financing Arrangements (Long term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt issuance costs $ (11,498) $ (10,873)
Total 543,954 508,312
Less: current maturities of debt 24,597 31,097
Long-term debt 519,357 477,215
Term loan due 2024    
Debt Instrument [Line Items]    
Long-term debt 287,335 288,033
Debt instrument, face amount 288,000  
Tax Exempt Bonds    
Debt Instrument [Line Items]    
Long-term debt 98,075 53,090
Debt instrument, face amount 98,100  
Convertible Debt    
Debt Instrument [Line Items]    
Long-term debt 116,860 115,367
Debt instrument, face amount 155,300  
Other Debt    
Debt Instrument [Line Items]    
Long-term debt $ 53,182 $ 62,695