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Debt Obligations (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Convertible Debt [Table Text Block] The carrying value of the Company's convertible debt is shown below.
September 30,December 31,
20212020
Principal value, Convertible Senior Notes, due 2024258,750 258,750 
Unamortized issuance costs(3,144)(3,894)
Unamortized discount(26,306)(32,465)
Convertible debt229,300 222,391 
Schedule of Long-term Debt Instruments
Debt obligations consisted of the following (in thousands):
 September 30,December 31,
 20212020
Senior Notes$697,046 $493,376 
Revolving credit facility432,000 140,000 
Unsubordinated term loans— 612,169 
Convertible debt229,300 222,391 
Other financing arrangements10,848 11,141 
Total debt obligations1,369,194 1,479,077 
Less: current portion(625)(13,746)
Total long term obligations, net$1,368,569 $1,465,331