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Debt Obligations (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Convertible Debt [Table Text Block]
The carrying value of the Company's Convertible debt is shown below.
 
 
December 31,
 
December 31,
 
 
2018
 
2017
Principal value, Convertible Senior Notes, due 2024
 
258,750

 
258,750

Unamortized issuance costs
 
(5,799
)
 
(6,685
)
Unamortized discount
 
(48,105
)
 
(55,515
)
Convertible debt
 
204,846

 
196,550

Schedule of Long-term Debt Instruments
Debt obligations consisted of the following (in thousands):
 
 
December 31,
 
December 31,
 
2018
 
2017
Unsubordinated term loans
$
721,406

 
$
70,568

Revolving credit facility
475,000

 
245,000

Aircraft loan

 
3,640

Convertible debt
204,846

 
196,550

Total debt obligations
1,401,252

 
515,758

Less: current portion
(29,654
)
 
(18,512
)
Total long term obligations, net
$
1,371,598

 
$
497,246

Schedule of Maturities of Long-term Debt
The scheduled cash principal payments for the Company's debt obligations, as of December 31, 2018, for the next five years are as follows (in thousands):
 
Principal
Payments
2019
$
31,875

2020
48,750

2021
48,750

2022
45,000

2023
1,031,875

2024 and beyond
258,750

Total principal cash payments
1,465,000

Less: unamortized issuance costs and discounts
(63,748
)
Total debt obligations
$
1,401,252