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Debt Obligations (Tables)
 6 Months Ended
Jun. 30, 2019
DEBT OBLIGATIONS [Abstract]  
Schedule of Debt [Table Text Block] :
 
As of
(in thousands)
June 30, 2019
 
December 31, 2018
Credit Facility:
 
 
 
Revolving credit agreements, due 2023
$
6,129

 
$
215,725

 


 


Convertible Debt:
 
 
 
0.75% convertible notes, unsecured, due 2049
429,563

 
—

1.50% convertible notes, unsecured, due 2044
—

 
379,859

 
 
 
 
1.375% Senior Notes, due 2026
682,080

 
—

 
 
 
 
Other obligations
24,279

 
38,513

 
 
 
 
Total debt obligations
1,142,051

 
634,097

Unamortized debt issuance costs
(21,318
)
 
(6,298
)
Carrying value of debt
1,120,733

 
627,799

Short-term debt obligations and current maturities of long-term debt obligations
(23,998
)
 
(38,017
)
Long-term debt obligations
$
1,096,735

 
$
589,782