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Debt and Credit Facilities - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Short-term debt $ 50,000 $ 50,000
Convertible senior notes 400,000 400,000
Debt discount   (51,138)
Long-term debt issuance costs (9,654) (8,864)
Total long-term 590,346 539,998
Total Debt 640,346 589,998
Senior Notes    
Debt Instrument [Line Items]    
Short-Term 50,000 50,000
Long-term debt $ 200,000 $ 200,000