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Financing Agreements (Convertible Senior Notes) (Details)
6 Months Ended
Jun. 03, 2019
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]      
Proceeds from issuance of Series C Preferred Stock   $ 0 $ 223,444,000
Convertible Debt      
Debt Instrument [Line Items]      
Proceeds from issuance of Series C Preferred Stock $ 230,000,000.0    
Proceed from debt net of offering expenses and underwriting discount $ 223,300,000    
Stated interest rate 6.25%    
Conversion ratio 125.7387    
Debt instrument, face amount $ 1,000    
Conversion price | $ / shares $ 7.95    
Effective interest rate 6.94%    
Additional Convertible Senior Notes      
Debt Instrument [Line Items]      
Proceeds from issuance of Series C Preferred Stock $ 30,000,000.0