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Long-term Debt (Tables)
 3 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Long term debt instruments
The following tables present our long-term debt instruments outstanding as well as future principal payments due:
 
December 31, 2017
 
December 31, 2016
 
September 30, 2017
 
Gross Amount
 
Debt Discount and Issuance Costs
 
Carrying Amount
 
Gross Amount
 
Debt Discount and Issuance Costs
 
Carrying Amount
 
Gross Amount
 
Debt Discount and Issuance Costs
 
Carrying Amount
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
2.125% Cash Convertible Senior Notes Due 2019
$
195,000

 
$
(15,165
)
 
$
179,835

 
$
230,000

 
$
(29,272
)
 
$
200,728

 
$
195,000

 
$
(17,654
)
 
$
177,346

Cash Convertible Senior Notes Due 2019 Embedded Derivative
12,863

 
—

 
12,863

 
29,800

 
—

 
29,800

 
6,591

 
—

 
6,591

2.875% Convertible Senior Notes Due 2024
143,750

 
(41,687
)
 
102,063

 
 
 
—

 
—

 
143,750

 
(42,880
)
 
100,870

Term Loan Facility
—

 
—

 
—

 
50,000

 
(1,592
)
 
48,408

 
—

 
—

 
—

 
$
351,613

 
$
(56,852
)
 
$
294,761

 
$
309,800

 
$
(30,864
)
 
$
278,936

 
$
345,341

 
$
(60,534
)
 
$
284,807
Principal payment schedule
 
Principal Payment Schedule
 
Total
 
Less Than 1 Year
 
1 - 3 Years
 
3 - 5 Years
 
More Than 5 Years
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
2.125% Cash Convertible Senior Notes Due 2019*
$
195,000

 
$
—

 
$
195,000

 
$
—

 
$
—

2.875% Convertible Senior Notes Due 2024*
143,750

 
—

 
—

 
—

 
143,750

 
$
338,750

 
$
—

 
$
195,000

 
$
—

 
$
143,750


*
Excludes the potential impact of the embedded derivative.