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Senior Notes (Tables)
 3 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Senior Notes
The following table presents the carrying amounts and fair values for the Senior Notes at December 31, 2016 and September 30, 2016:
 
December 31, 2016
 
September 30, 2016
 
Carrying
Amounts
 
Fair Value
 
Carrying
Amounts (1)
 
Fair Value (1)
 
(In thousands)
The 2008 Senior Notes
$
131,000

 
$
138,035

 
$
131,000

 
$
139,902

The 2010 Senior Notes
185,000

 
192,295

 
185,000

 
195,715

Debt issuance costs
(328
)
 
(328
)
 
(376
)
 
(376
)
       Total
$
315,672

 
$
330,002

 
$
315,624

 
$
335,241

(1) Balances as of September 30, 2016 have been recast as a result of the adoption of ASU 2015-03, to present debt issuance costs of $0.4 million as a direct deduction from the carrying amount of the Senior Notes.