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LONG-TERM DEBT - Convertible Debt Narrative (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
shares
numberOfDay
$ / shares
Dec. 31, 2020
USD ($)
Jul. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Debt instrument, convertible, threshold percentage of stock price trigger for redemption 130.00%    
Debt instrument, convertible, threshold trading days for redemption 20    
Threshold consecutive trading days for redemption 30 days    
Remaining amortization period of convertible debt 28 months    
Convertible debt      
Debt Instrument [Line Items]      
Principal amount, long-term debt issued | $ $ 93,100,000   $ 230,000,000.0
Interest rate on convertible debt 5.00%   5.00%
Repurchased face amount | $   $ 136,900,000  
Initial conversion rate, convertible debt 46.0829    
Initial conversion price, convertible debt (in dollars per share) | $ / shares $ 21.70    
Threshold trading days 20    
Threshold consecutive trading days 30    
Threshold percentage of stock price trigger 130.00%    
Number of business days after the specified trading price criteria met that notes may be converted 5    
Consecutive trading days, trading price criteria 5 days    
Convertible debt, threshold percentage, product of common stock price and conversion price 98.00%    
Number of shares into which debt is convertible | shares 4,291,705    
Redemption price, percentage (equal to) 100.00%