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Debt - Convertible Senior Notes Narrative (Details)
3 Months Ended
Jul. 01, 2019
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2017
USD ($)
Jul. 31, 2014
USD ($)
Debt Instrument [Line Items]            
Amortization of debt discounts   $ 1,348,000 $ 2,364,000      
Share Price | $ / shares   $ 21.37        
Debt instrument, percentage of repurchase price to principal amount if company undergoes fundamental change   100.00%        
Debt instrument, event of default minimum percentage of principal amount   25.00%        
Debt instrument, percentage of repurchase price to principal amount if company defaults   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        
Debt instrument, convertible conversion price (in dollars per share) | $ / shares   $ 18.32        
Amortization of debt discounts   $ 2,803,000        
2022 Convertible Notes            
Debt Instrument [Line Items]            
Debt Instrument, Convertible, If-converted Value in Excess of Principal   (22,304,000)        
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  
Coupon Rate   3.50%     3.50%  
Debt instrument, convertible, conversion ratio   0.0437694        
Debt Instrument, Principal Amount Used For Conversion   $ 1,000        
Debt instrument, convertible conversion price (in dollars per share) | $ / shares   $ 22.85        
Amortization of debt discounts   $ 4,279,000 $ 4,217,000