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Debt Obligations (Tables)
12 Months Ended
Dec. 31, 2019
Debt Instrument [Line Items]  
Schedule of Long-term Debt Instruments [Table Text Block]

Debt obligations consist of the following as of December 31, 2019 and 2018:
 
 
As of December 31,
(in thousands)
 
2019
 
2018
Credit Facility:
 
 
 
 
Revolving credit agreements
 
$

 
$
215,725

Convertible Debt:
 
 
 
 
0.75% convertible notes, unsecured, due 2049
 
436,965

 

1.50% convertible notes, unsecured, due 2044
 

 
379,859

 
 
 
 
 
1.375% Senior Notes, due 2026
 
673,440

 

 
 
 
 
 
Other obligations
 
6,215

 
38,513

 
 
 
 
 
Total debt obligations
 
$
1,116,620

 
$
634,097

Unamortized debt issuance costs
 
(19,592
)
 
(6,298
)
Carrying value of debt
 
$
1,097,028

 
$
627,799

Short-term debt obligations and current maturities of long-term debt obligations
 
(6,089
)
 
(38,017
)
Long-term debt obligations
 
$
1,090,939

 
$
589,782