Annual report pursuant to Section 13 and 15(d)

Debt (Summary) (Details)

v3.19.3.a.u2
Debt (Summary) (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
May 25, 2018
Dec. 15, 2014
Outstanding debt obligations        
Revolving credit facility $ 260,000,000 $ 0    
Face amount       $ 172,500,000
Unaccredited discount on Convertible Notes     $ (48,000,000) $ (27,500,000)
Credit Agreement        
Outstanding debt obligations        
Revolving credit facility 260,000,000 0    
Convertible Notes Due 2019        
Outstanding debt obligations        
Face amount 0 172,500,000    
Unaccredited discount on Convertible Notes 0 (5,890,000)    
Unamortized issuance costs 0 (899,000)    
Convertible Debt 0 165,711,000    
Convertible Notes Due 2023        
Outstanding debt obligations        
Face amount 345,000,000 345,000,000 $ 345,000,000  
Unaccredited discount on Convertible Notes (33,491,000) (42,641,000)    
Unamortized issuance costs (5,996,000) (7,634,000)    
Convertible Debt $ 305,513,000 $ 294,725,000