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Debt - Convertible Senior Notes Narrative (Details)
3 Months Ended 6 Months Ended
Jul. 01, 2019
shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2017
USD ($)
Jul. 31, 2014
USD ($)
Debt Instrument [Line Items]                
Amortization of debt discounts       $ 2,697,000 $ 4,709,000      
Share Price | $ / shares   $ 27.53   $ 27.53        
Debt instrument, percentage of repurchase price to principal amount if company undergoes fundamental change   100.00%   100.00%        
Debt instrument, event of default minimum percentage of principal amount   25.00%   25.00%        
Debt instrument, percentage of repurchase price to principal amount if company defaults   100.00%   100.00%        
2019 Convertible Notes | Debt Instrument, Redemption, Period One [Member]                
Debt Instrument [Line Items]                
Convertible senior notes amount               $ 230,000,000
Coupon Rate               3.00%
Debt Conversion, Converted Instrument, Shares Issued | shares 12,553,864     12,553,864        
Debt instrument, convertible, conversion ratio       0.0545954        
Debt Instrument, Principal Amount Used For Conversion   $ 1,000   $ 1,000        
Debt instrument, convertible conversion price (in dollars per share) | $ / shares   $ 18.32   $ 18.32        
Amortization of debt discounts     $ 2,783,000   5,586,000      
2022 Convertible Notes                
Debt Instrument [Line Items]                
Debt Instrument, Convertible, If-converted Value in Excess of Principal       $ 70,715,000        
2022 Convertible Notes | Debt Instrument, Redemption, Period One [Member]                
Debt Instrument [Line Items]                
Convertible senior notes amount   $ 345,000,000   $ 345,000,000   $ 345,000,000 $ 345,000,000  
Coupon Rate   3.50%   3.50%     3.50%  
Debt instrument, convertible, conversion ratio       0.0437694        
Debt Instrument, Principal Amount Used For Conversion   $ 1,000   $ 1,000        
Debt instrument, convertible conversion price (in dollars per share) | $ / shares   $ 22.85   $ 22.85        
Amortization of debt discounts   $ 4,279,000 $ 4,217,000 $ 8,558,000 $ 8,434,000