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Lines of Credit and Long-Term Debt - Convertible Senior Subordinated Notes (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 12, 2019
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
D
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lines of Credit and Long-Term Debt        
Cash paid for interest   $ 2,844 $ 484  
Long term debt, net   229,442   $ 226,291
Accrued interest payable   711   $ 2,133
Convertible Senior Subordinated Notes        
Lines of Credit and Long-Term Debt        
Aggregate borrowings $ 325,000 $ 325,000    
Interest rate (as a percent) 1.75% 1.75%    
Initial conversion rate 0.0142966      
Initial conversion price | $ / shares $ 69.95      
Carrying amount of the equity component representing the conversion option $ 102,900      
Deferred tax effect $ 25,884      
Effective interest rate 8.05%      
Debt issuance costs $ 9,372      
Issuance costs attributable to the liability component $ 6,405      
Interest expense   $ 4,573 2,269  
Increase in accrued interest   1,421 743  
Non-cash accretion of the debt discounts   3,152 $ 1,527  
Long term debt, net   229,442    
Accrued interest payable   $ 711    
Debt Conversion Scenario One | Convertible Senior Subordinated Notes        
Lines of Credit and Long-Term Debt        
Trading days | D   20    
Consecutive trading days | D   30    
Stock price trigger percentage (as a percent)   130.00%    
Debt Conversion Scenario Two | Convertible Senior Subordinated Notes        
Lines of Credit and Long-Term Debt        
Trading days | D   5    
Consecutive trading days | D   5    
Principal amount   $ 1    
Stock price trigger percentage (as a percent)   98.00%