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Net Change in Operating Assets and Liabilities
 12 Months Ended
Dec. 31, 2012
Net Change in Operating Assets and Liabilities  
Net Change in Operating Assets and Liabilities
Net Change in Operating Assets and Liabilities
Net change in operating assets and liabilities, net of the effects of acquisitions and dispositions, consisted of the following:
 
Years Ended December 31,
(In thousands)
2012
 
2011
 
2010
Decrease (increase) in operating assets:
 
 
 
 
 
Accounts receivable
$
124,983

 
$
(52,805
)
 
$
(15,200
)
Inventory
(46,126
)
 
(64,543
)
 
(6,872
)
Prepaid expenses and other assets
33,520

 
(6,363
)
 
251

Increase (decrease) in operating liabilities:
 
 
 
 
 
Accounts payable
(34,972
)
 
16,233

 
3,797

Income tax payable
(40,263
)
 
(17,832
)
 
—

Interest payable
(40,792
)
 
—

 
—

Asset retirement obligation
(1,467
)
 
(1,030
)
 
(632
)
Accrued expenses
(54,763
)
 
6,151

 
(1,481
)
 
$
(59,880
)
 
$
(120,189
)
 
$
(20,137
)