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Debt Obligations (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of debt obligations
 
 
As of
(in thousands)
 
September 30, 2021

 
December 31, 2020

Credit Facility:
 
 
 
 
Revolving credit agreement
 
$
53,200

 
$
270,400

Convertible Debt:
 
 
 
 
0.75% convertible notes, unsecured, due 2049
 
464,161

 
452,228






1.375% Senior Notes, due 2026
 
694,860

 
732,840






Other obligations
 
1,054

 
850










Total debt obligations
 
1,213,275

 
1,456,318

Unamortized debt issuance costs
 
(14,795
)
 
(17,932
)
Carrying value of debt
 
1,198,480

 
1,438,386

Short-term debt obligations and current maturities of long-term debt obligations
 
(985
)
 
(797
)
Long-term debt obligations
 
$
1,197,495

 
$
1,437,589