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Long-Term Debt - Convertible Senior Notes Due 2023 (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Principal amount $ 412,982   $ 412,982    
Interest expense 7,179 $ 8,045 14,573 $ 15,941  
Unamortized debt discount 19,224   19,224    
Convertible Senior Notes Maturing September 2023          
Debt Instrument [Line Items]          
Principal amount $ 125,000   $ 125,000   $ 125,000
Interest rate (as a percent) 4.125%   4.125%    
Frequency of periodic payment     semi-annually    
Maturity date     Sep. 15, 2023    
Initial conversion ratio     0.1056133    
Initial conversion price per share (in dollars per share) | $ / shares $ 9.47   $ 9.47    
Redemption price as a percentage of principal amount     100.00%    
Minimum percentage in aggregate principal amount 25.00%   25.00%    
Carrying amount of equity component $ 15,900   $ 15,900    
Effective interest rate (as a percent) 7.80%   7.80%    
Interest expense $ 2,200 $ 2,100 $ 4,300 $ 4,200  
Unamortized debt discount $ 12,829   $ 12,829   $ 14,500