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Supplemental Schedule Of Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]  
Non-cash Financing and Investing Activity
The following table reflects non-cash financing and investing activity during the following periods:
 
 
Nine Months Ended September 30,
 
 
2016
 
2015
 
 
(In thousands)
Capital leases issued for equipment
 
$
5,151

 
$
13,676

Asset retirement obligation additions (retirements)
 
$
(21
)
 
$
—