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Debt Obligations (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Convertible Debt [Table Text Block] The carrying value of the Company's convertible debt is shown below.
December 31,December 31,
20202019
Principal value, Convertible Senior Notes, due 2024258,750 258,750 
Unamortized issuance costs(3,894)(4,864)
Unamortized discount(32,465)(40,425)
Convertible debt222,391 213,461 
Schedule of Long-term Debt Instruments
Debt obligations consisted of the following (in thousands):
 December 31,December 31,
 20202019
Unsubordinated term loans$612,169 $626,277 
Revolving credit facility140,000 632,900 
Senior notes493,376 — 
Convertible debt222,391 213,461 
Other financing arrangements11,141 11,746 
Total debt obligations1,479,077 1,484,384 
Less: current portion(13,746)(14,707)
Total long term obligations, net$1,465,331 $1,469,677 
Schedule of Maturities of Long-term Debt
The scheduled cash principal payments for the Company's debt obligations, as of December 31, 2020, for the next five years are as follows (in thousands):
Principal
Payments
2021$16,491 
202232,378 
202332,389 
2024939,150 
2025661 
2026 and beyond507,947 
Total principal cash payments1,529,016 
Less: unamortized issuance costs and discounts(49,939)
Total debt obligations$1,479,077