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Debt Obligations (Tables)
3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Convertible Debt [Table Text Block]
The carrying value of the Company's Convertible debt is shown below.
 
 
March 31,
 
December 31,
 
 
2019
 
2018
Principal value, Convertible Senior Notes, due 2024
 
258,750

 
258,750

Unamortized issuance costs
 
(5,569
)
 
(5,799
)
Unamortized discount
 
(46,211
)
 
(48,105
)
Convertible debt
 
206,970

 
204,846

Schedule of Long-term Debt Instruments
Debt obligations consisted of the following (in thousands):
 
 
March 31,
 
December 31,
 
2019
 
2018
Unsubordinated term loans
$
714,027

 
$
721,406

Revolving credit facility
475,000

 
475,000

Convertible debt
206,970

 
204,846

Other financing arrangements
12,136

 

Total debt obligations
1,408,133

 
1,401,252

Less: current portion
(34,707
)
 
(29,654
)
Total long term obligations, net
$
1,373,426

 
$
1,371,598