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Debt Obligations (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of debt obligations
 
 
As of
(in thousands)
 
March 31, 2021
 
December 31, 2020
Credit Facility:
 
 
 
 
Revolving credit agreement
 
$

 
$
270,400

Convertible Debt:
 
 
 
 
0.75% convertible notes, unsecured, due 2049
 
456,159

 
452,228

 
 
 
 
 
1.375% Senior Notes, due 2026
 
703,680

 
732,840

 
 
 
 
 
Other obligations
 
813

 
850

 
 
 
 
 
Total debt obligations
 
1,160,652

 
1,456,318

Unamortized debt issuance costs
 
(16,883
)
 
(17,932
)
Carrying value of debt
 
1,143,769

 
1,438,386

Short-term debt obligations and current maturities of long-term debt obligations
 
(743
)
 
(797
)
Long-term debt obligations
 
$
1,143,026

 
$
1,437,589