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Long-Term Debt - Convertible Senior Notes Due 2022 (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]          
Interest expense $ 7,179 $ 8,045 $ 14,573 $ 15,941  
Unamortized debt discount $ 19,224   $ 19,224    
Convertible Senior Notes Maturing May 2022          
Debt Instrument [Line Items]          
Interest rate (as a percent) 4.25%   4.25%    
Frequency of periodic payment     semi-annually    
Maturity date     May 01, 2022    
Initial conversion ratio     0.0719748    
Initial conversion price per share (in dollars per share) | $ / shares $ 13.89   $ 13.89    
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 $ 11,000   $ 11,000    
Effective interest rate (as a percent) 7.30%   7.30%    
Interest expense $ 2,100 $ 2,100 $ 4,300 $ 4,200  
Unamortized debt discount $ 6,395   $ 6,395   $ 8,000