Consolidated Statements of Cash Flows

Changes in the components of operating assets and liabilities are as follows (in thousands):



	Year Ended December 31,
	2011			2012			2013
Restricted cash	$	14,379		$	—		$	—
Trade accounts receivable and other accounts receivable	5,791			(10,867		)	(19,314		)
Inventory	(42,452		)	36,972			34,664
Energy commodity derivatives contracts, net of derivatives deposits	(19,782		)	16,097			534
Accounts payable	20,226			(11,175		)	2,002
Accrued payroll and benefits	(2,209		)	2,250			9,809
Accrued interest payable	4,069			1,512			2,876
Accrued taxes other than income	617			5,519			5,485
Accrued product purchases	12,476			12,249			(9,016		)
Deferred revenue	5,250			6,388			16,793
Current and noncurrent environmental liabilities	16,861			(1,372		)	(12,247		)
Other current and noncurrent assets and liabilities	(740		)	(14,874		)	(15,878		)
Total	$	14,486		$	42,699		$	15,708

At December 31, 2011, 2012 and 2013, the long-term pension and benefits liability was increased (decreased) by $37.1 million, $1.8 million and $(14.1) million, respectively, resulting in a corresponding increase (decrease) in accumulated other comprehensive loss. These non-cash amounts were reflected in the consolidated financial statements but were not reflected in the statements of cash flows.