Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities:
Net Income	$ 9,720	$ 78,185
Less (gain) from discontinued operations, net of taxes	0	(14,247)
Adjustments to reconcile net income to net cash provided by operation activities -
Depreciation, depletion, and amortization	181,638	163,141
Accretion of asset retirement obligation	3,465	3,482
Deferred income taxes	8,239	36,332
Stock-based compensation expenses	10,562	9,281
Other	(583)	(1,410)
Change in assets and liabilities-
Decrease in accounts receivable	14,385	6,694
Increase (decrease) in accounts payable and accrued liabilities	(3,051)	8,077
Decrease in income taxes payable	(248)	(234)
Increase (decrease) in accrued interest	(443)	(787)
Cash provided by operating activities - continuing operations	223,684	288,514
Cash provided by operating activities - discontinued operations	0	5
Net Cash Provided by Operating Activities	223,684	288,519
Cash Flows from Investing Activities:
Additions to property and equipment	(575,711)	(368,754)
Proceeds from the sale of property and equipment	523	6,084
Cash used in investing activities - continuing operations	(575,188)	(362,670)
Cash provided by investing activities - discontinued operations	0	5,000
Net Cash Used in Investing Activities	(575,188)	(357,670)
Cash Flows from Financing Activities:
Proceeds from Lines of Credit	102,640	0
Net proceeds from issuances of common stock	1,599	2,102
Purchase of treasury shares	(2,781)	(3,319)
Cash used in financing activities - continuing operations	101,458	(1,217)
Cash provided by financing activities - discontinued operations	0	0
Net Cash Used in Financing Activities	101,458	(1,217)
Net Decrease in Cash and Cash Equivalents	(250,046)	(70,368)
Cash and Cash Equivalents at Beginning of Period	251,696	86,367
Cash and Cash Equivalents at End of Period	1,650	15,999
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized	39,175	24,693
Cash paid during period for income taxes	$ 248	$ 1,770