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Debt Obligations (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Convertible Debt [Table Text Block] The carrying value of the Company's convertible debt is shown below.
March 31,December 31,
20212020
Principal value, Convertible Senior Notes, due 2024258,750 258,750 
Unamortized issuance costs(3,646)(3,894)
Unamortized discount(30,430)(32,465)
Convertible debt224,674 222,391 
Schedule of Long-term Debt Instruments
Debt obligations consisted of the following (in thousands):
 March 31,December 31,
 20212020
Unsubordinated term loans$608,568 $612,169 
Revolving credit facility160,000 140,000 
Senior Notes493,543 493,376 
Convertible debt224,674 222,391 
Other financing arrangements11,045 11,141 
Total debt obligations1,497,830 1,479,077 
Less: current portion(619)(13,746)
Total long term obligations, net$1,497,211 $1,465,331