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Debt Obligations (Tables)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Convertible Debt [Table Text Block] The carrying value of the Company's convertible debt is shown below.
June 30,December 31,
20202019
Principal value, Convertible Senior Notes, due 2024258,750  258,750  
Unamortized issuance costs(4,383) (4,864) 
Unamortized discount(36,481) (40,425) 
Convertible debt217,886  213,461  
Schedule of Long-term Debt Instruments
Debt obligations consisted of the following (in thousands):
 June 30, December 31,
 20202019
Unsubordinated term loan$619,202  $626,277  
Revolving credit facility177,900  632,900  
Senior notes492,907  —  
Convertible debt217,886  213,461  
Other financing arrangements11,444  11,746  
Total debt obligations1,519,339  1,484,384  
Less: current portion(13,769) (14,707) 
Total long term obligations, net$1,505,570  $1,469,677