Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ 39,525	$ (1,052)
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	82,511	86,504
Loss on extinguishment of debt		7,209
Gain on disposition of assets	(1,993)	(3,560)
Deferred income tax expense	19,736	(4,685)
Expenses not requiring cash	11,074	10,740
Change in accounts receivable	(4,476)	3,429
Change in other assets	48,869	(3,675)
Change in liabilities	(16,531)	(9,179)
Net cash provided by operating activities	178,715	85,731
Cash flows from investing activities:
Capital expenditures	(141,841)	(181,556)
Proceeds from the sale of assets	3,425	4,585
Proceeds from insurance settlements	250
Net cash used in investing activities	(138,166)	(176,971)
Cash flows from financing activities:
Proceeds from issuance of debt	50,000	300,000
Proceeds from draw on revolver credit facility		20,000
Repayment of senior notes		(225,000)
Repayments of term loan	(15,000)	(9,000)
Repayments of revolver	(25,000)	(42,000)
Payments of debt issuance costs	(504)	(8,001)
Payments of debt extinguishment costs		(7,466)
Proceeds from stock options exercised	183	26
Excess tax benefit from stock based compensation	1,424	1,212
Net cash provided by financing activities	11,103	29,771
Net increase (decrease) in cash and cash equivalents	51,652	(61,469)
Cash and cash equivalents, beginning of year	51,431	108,803
Cash and cash equivalents, end of period	103,083	47,334
Supplemental cash flow information:
Interest paid	18,416	15,518
Income taxes paid	$ 6,140	$ 15,352