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Debt Obligations, Convertible Senior Unsecured Notes (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 20, 2018
USD ($)
$ / shares
Jul. 03, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Nov. 30, 2017
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
$ / shares
Jul. 31, 2018
Debt Obligations                      
Cash paid for the exchange of convertible notes             $ 219,922        
(Loss) gain on extinguishment of debt         $ (4,960)   (4,960) $ 7,116      
Convertible Senior Unsecured Notes                      
Debt Obligations                      
Principal amount     $ 280,816   280,816   $ 280,816   $ 243,750    
Proceeds received, net of estimated issuance costs         34,500            
Percentage of the Notes required to be repurchased if the agreement is fundamentally changed                   100.00%  
Maturity period (in years)             2 years 8 months 19 days   2 years 4 months 28 days    
Unamortized Debt Discount     9,285   9,285   $ 9,285   $ 5,742    
Unamortized Deferred Financing Fees     7,878   7,878   7,878   6,721    
Net Carrying Value, Liability Component     $ 263,653   263,653   263,653   231,287    
Net Carrying Value, Equity Component             9,436   $ 6,733    
Total interest expense         5,000 $ 2,200 16,000 6,600      
Interest expense related to cash coupon         3,100 1,600 9,900 4,800      
Deferred fees expensed as interest expense         1,000 400 4,100 1,100      
Debt discount         $ 900 $ 200 $ 2,000 $ 700      
Cost of the notes (as a percent)     7.45%   7.45% 7.45% 7.45% 7.45%      
5.375% Convertible Notes                      
Debt Obligations                      
Principal amount     $ 16,200   $ 16,200   $ 16,200        
Interest rate (as a percent)     5.375%   5.375%   5.375%       5.375%
Cash paid for the exchange of convertible notes         $ 127,600            
Conversion rate of the notes to common stock, per $1,000 principal amount of notes     109.2211 107.7122              
Conversion price per share of common stock | $ / shares     $ 9.16 $ 9.28 $ 9.16   $ 9.16        
6.50% Convertible Notes                      
Debt Obligations                      
Additional principal amount     $ 200   $ 200   $ 200        
Interest rate (as a percent)     6.50%   6.50%   6.50%       6.50%
Cash paid for the exchange of convertible notes         $ 99,800            
Conversion rate of the notes to common stock, per $1,000 principal amount of notes     123.2929             119.3033  
Conversion price per share of common stock | $ / shares     $ 8.11   $ 8.11   $ 8.11     $ 8.38  
5.25% Convertible Notes                      
Debt Obligations                      
Principal amount     $ 264,500   $ 264,500   $ 264,500        
Interest rate (as a percent)     5.25%   5.25%   5.25%        
Proceeds received, net of estimated issuance costs         $ 256,100            
5.25% Convertible Notes | First Offering                      
Debt Obligations                      
Principal amount   $ 115,000                  
Conversion rate of the notes to common stock, per $1,000 principal amount of notes   86.9943                  
Conversion price per share of common stock | $ / shares   $ 11.50                  
5.25% Convertible Notes | Second Offering                      
Debt Obligations                      
Principal amount $ 149,500                    
Conversion rate of the notes to common stock, per $1,000 principal amount of notes 77.8331                    
Conversion price per share of common stock | $ / shares $ 12.85                    
5.375% and 6.50% Convertible Notes                      
Debt Obligations                      
Cash paid for the exchange of convertible notes         $ 219,800            
Common stock exchanged (in shares) | shares         6.8            
(Loss) gain on extinguishment of debt         $ 5,000            
Inducement charge         $ 1,100