Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ 19,631	$ (18,493)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,984	32,980
Accretion on asset retirement obligation	28	32
Change in allowance for doubtful accounts	382	(1,269)
Amortization of deferred financing costs	693	432
Amortization and retirement of discount or premium on notes	(50)	6,493
Non-cash compensation	2,397	1,680
Loss on early extinguishment of debt (non-cash)		3,940
Premium on retirement of 11.625% senior secured notes		36,179
(Gain) loss on disposal of assets	1,719	(1,705)
Deferred income taxes	11,369	(17,002)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	8,027	(25,936)
Inventories	(2,961)	(2,468)
Prepaid expenses and other current assets	(3,803)	(1,548)
Other assets	196	(2,218)
Accounts payable	(18,060)	238
Excess tax expense (benefit) from exercise of employee stock options / vesting of restricted stock		(1,955)
Income tax payable	617	2,301
Other liabilities	1,136	(323)
Accrued expenses	(84)	9,644
Net cash provided by (used in) operating activities	65,221	21,002
Cash flows from investing activities:
Purchase of property and equipment	(46,823)	(72,442)
Proceeds from sale of assets	1,987	16,687
Payments for other long-term assets	(171)	(140)
Payments for businesses, net of cash acquired	(18,584)	(10)
Net cash used in investing activities	(63,591)	(55,905)
Cash flows from financing activities:
Proceeds from debt		275,000
Payments of debt	(9,644)	(229,891)
Premium on retirement of 11.625% senior secured notes		(36,179)
Purchase of treasury stock	(3,283)	(1,715)
Excess tax (expense) benefit from exercise of employee stock options / vesting of restricted stock		1,955
Tax withholding from exercise of stock options	(34)	(854)
Exercise of employee stock options	104	1,805
Deferred loan costs and other financing activities	(1)	(9,371)
Net cash provided by (used in) financing activities	(12,858)	750
Net increase (decrease) in cash and equivalents	(11,228)	(34,153)
Cash and cash equivalents - beginning of period	78,458	47,918
Cash and cash equivalents - end of period	$ 67,230	$ 13,765