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Borrowings - Convertible Senior Notes (Details) - Convertible Senior Notes
May 26, 2017
USD ($)
day
$ / shares
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 13, 2013
USD ($)
Debt Instrument [Line Items]        
Carrying amount of convertible debt   $ 44,910,000 $ 76,216,000  
Note Due 2020        
Debt Instrument [Line Items]        
Face amount       $ 287,500,000
Stated percentage       3.00%
Interest rate at period end   4.92%    
Note Due 2023        
Debt Instrument [Line Items]        
Face amount $ 345,000,000.0      
Stated percentage 3.50%      
Minimum sales price for conversion 130.00%      
Trading days threshold | day 20      
Consecutive treading days threshold 30      
Conversion ratio 21.6275      
Minimum average share price triggering dilutive effect (usd per share) | $ / shares $ 46.24      
Convertible debt, estimated fair value $ 298,800,000      
Carrying amount of convertible debt 46,200,000      
Debt Issuance Cost 8,300,000      
Equity and debt issuance costs 9,600,000      
Equity Issuance Costs $ 1,300,000      
Interest rate at period end   6.20%