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Supplemental Schedule of Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 2017
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:
 
 
Three Months Ended March 31,
 
 
2017
 
2016
 
 
(In thousands)
Capital leases and notes issued for equipment
 
$
22,374

 
$
1,390

Asset retirement obligation additions (retirements)
 
$
—

 
$
9