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Debt Obligations (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Convertible Debt [Table Text Block] The carrying value of the Company's convertible debt is shown below.
September 30,December 31,
20202019
Principal value, Convertible Senior Notes, due 2024258,750 258,750 
Unamortized issuance costs(4,140)(4,864)
Unamortized discount(34,482)(40,425)
Convertible debt220,128 213,461 
Schedule of Long-term Debt Instruments
Debt obligations consisted of the following (in thousands):
 September 30, December 31,
 20202019
Unsubordinated term loan$615,686 $626,277 
Revolving credit facility140,400 632,900 
Senior notes493,142 — 
Convertible debt220,128 213,461 
Other financing arrangements11,230 11,746 
Total debt obligations1,480,586 1,484,384 
Less: current portion(13,742)(14,707)
Total long term obligations, net$1,466,844 $1,469,677