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Lines of Credit and Long-Term Debt - Long-term debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Capital Lease Obligations    
Long term debt, gross $ 325,000  
Unamortized discount, including debt issuance costs, on convertible senior subordinated notes (104,811)  
Long term debt, net 220,189  
Finance leases 557  
Capital leases   $ 1,097
Total long-term debt and finance leases, net 220,746 1,097
Less current portion, net (548) (945)
Total long-term debt and finance leases, less current portion, net $ 220,198 $ 152