XML 70 R63.htm IDEA: XBRL DOCUMENT v3.20.1
LONG-TERM DEBT, LETTERS OF CREDIT AND DERIVATIVES - Convertible Debt Narrative (Details)
3 Months Ended
May 17, 2018
USD ($)
Mar. 31, 2020
shares
days
$ / shares
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 | days   20  
Threshold consecutive trading days for redemption   30 days  
Percentage of the maximum number of shares authorized for issuance   40.00%  
Percentage of maximum number of shares that would require cash settlement   60.00%  
Tax impact of convertible debt embedded derivative liability reclassification to equity | $ $ 7,800,000    
Remaining amortization period of convertible debt   40 months  
Convertible debt      
Debt Instrument [Line Items]      
Principal amount, long-term debt issued | $     $ 230,000,000.0
Interest rate on convertible debt   5.00% 5.00%
Initial conversion rate, convertible debt   46.0829  
Initial conversion price, convertible debt (in dollars per share) | $ / shares   $ 21.70  
Threshold trading days | days   20  
Threshold consecutive trading days | 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 | days   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 (in shares) | shares   10,599,067  
Shares outstanding, percentage threshold (more than)   19.99%  
Convertible debt, threshold shares, approval of shareholders | shares   5,964,858  
Redemption price, percentage (equal to)   100.00%  
Convertible debt | Maximum      
Debt Instrument [Line Items]      
Number of shares into which debt is convertible (in shares) | shares   14,838,703  
Number of shares that would require cash settlement | shares   8,873,845  
Long-term debt | Not Designated as Hedging Instrument      
Debt Instrument [Line Items]      
Embedded derivative liability | $ $ 45,400,000