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Debt Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Revolving credit agreement $ 270,400
Senior notes 703,700  
Other obligations 813 850
Total debt obligations 1,160,652 1,456,318
Unamortized debt issuance costs (16,883) (17,932)
Carrying value of debt 1,143,769 1,438,386
Short-term debt obligations and current maturities of long-term debt obligations (743) (797)
Long-term debt obligations 1,143,026 1,437,589
Due 2049 [Member]    
Debt Instrument [Line Items]    
Convertible Debt 456,159 452,228
Due 2026 [Member]    
Debt Instrument [Line Items]    
Senior notes $ 703,680 $ 732,840