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Lines of Credit and Long-Term Debt - Convertible Senior Subordinated Notes (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 12, 2019
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
D
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Lines of Credit and Long-Term Debt          
Cash paid for interest     $ 364 $ 121  
Long term debt, net   $ 220,189 220,189    
Accrued interest payable   2,167 2,167   $ 121
Convertible Senior Subordinated Notes          
Lines of Credit and Long-Term Debt          
Aggregate borrowings $ 325,000 $ 325,000 $ 325,000    
Interest rate (as a percent) 1.75% 1.75% 1.75%    
Initial conversion rate 0.0142966        
Initial conversion price | $ / shares $ 69.95        
Principal amount       1  
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 $ 8,937        
Third party offering costs 435        
Issuance costs attributable to the liability component $ 6,405        
Interest expense   $ 4,389   6,659  
Cash paid for interest   1,422   2,164  
Non-cash accretion of the debt discounts   2,967   $ 4,494  
Long term debt, net   220,189 $ 220,189    
Accrued interest payable   $ 2,164 $ 2,164    
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    
Stock price trigger percentage (as a percent)     98.00%