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Senior Notes (Tables)
 3 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Carrying Amounts and Fair Values of Senior Notes
The following table presents the carrying amounts and fair values for the Senior Notes at December 31, 2017 and September 30, 2017:
 
December 31, 2017
 
September 30, 2017
 
Carrying
Amounts
 
Fair Value
 
Carrying
Amounts
 
Fair Value
 
(In thousands)
The 2008 Senior Notes
$
131,000

 
$
132,814

 
$
131,000

 
$
134,250

The 2010 Senior Notes
113,000

 
117,669

 
113,000

 
119,106

Debt issuance costs
(166
)
 
(166
)
 
(199
)
 
(199
)
       Total
$
243,834

 
$
250,317

 
$
243,801

 
$
253,157