Supplemental Disclosures to the Consolidated Statements of Cash Flows

12 Months Ended

Dec. 31, 2011

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures to the Consolidated Statements of Cash Flows

Supplemental disclosures to the consolidated statements of cash flows

Supplemental disclosures to the consolidated statements of cash flows are presented below:

	Year ended December 31,
	2011			2010			2009
Net cash provided by operating activities included:
Cash payments for interest	$	85,222		$	67,529		$	86,778
Interest capitalized	(2,379		)	(2,036		)	(836		)
Cash payments for interest, net of amounts capitalized	$	82,843		$	65,493		$	85,942
Cash (receipts) payments for income taxes	$	179		$	(21	)	$	(23	)
Non-cash investing activities included:
Asset retirement costs capitalized	$	2,522		$	1,488		$	1,322
Oil and natural gas properties acquired through increase (decrease) in accounts payable and accrued liabilities	$	(14,667	)	$	25,773		$	(27,511	)
Non-cash financing activities included:
Modification of Time Vesting equity awards to liability plan	$	2,640		$	—		$	—

In December 2009, we exchanged the assets of the Chemicals Division of Green Country Supply for assets received from Reef Services, LLC and cash of $696. The assets received consisted primarily of acid trucks and related equipment and had an estimated fair value of approximately $2,950. This transaction was considered a non-monetary exchange accounted for at fair value.