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Debt Obligations (Tables)
 3 Months Ended
Mar. 31, 2020
DEBT OBLIGATIONS [Abstract]  
Schedule of Debt [Table Text Block] :
 
 
As of
(in thousands)
 
March 31, 2020
 
December 31, 2019
Credit Facility:
 
 
 
 
Revolving credit agreement
 
$
—

 
$
—

Convertible Debt:
 
 
 
 
0.75% convertible notes, unsecured, due 2049
 
440,713

 
436,965

 
 
 
 
 
1.375% Senior Notes, due 2026
 
661,560

 
673,440

 
 
 
 
 
Other obligations
 
3,598

 
6,215

 
 
 
 
 
Total debt obligations
 
1,105,871

 
1,116,620

Unamortized debt issuance costs
 
(18,725
)
 
(19,592
)
Carrying value of debt
 
1,087,146

 
1,097,028

Short-term debt obligations and current maturities of long-term debt obligations
 
(3,528
)
 
(6,089
)
Long-term debt obligations
 
$
1,083,618

 
$
1,090,939