Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income (loss)	$ 47,163	$ (43,563)	$ (253,538)
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	154,341	135,001	132,520
Gain on bargain purchase		(1,772)
Goodwill impairment			204,014
Accretion on asset retirement obligation	124	162	149
Change in allowance for doubtful accounts	(1,848)	(1,679)	(1,081)
Amortization of deferred financing costs	2,349	1,567	1,414
Amortization of discount or premium on notes	6,385	1,937	740
Non-cash compensation	7,955	5,666	5,152
Loss on early extinguishment of debt (non-cash)	3,940		3,481
Premium on retirement of 11.625% senior secured notes	36,179
Loss on disposal of assets	447	2,856	2,650
Deferred income taxes	30,695	(5,993)	(25,230)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(88,863)	(55,304)	88,149
Inventories	(12,057)	(2,411)	975
Prepaid expenses and other current assets	(1,344)	4,800	(1,444)
Other assets	(2,853)	(949)	(1,010)
Accounts payable	12,140	16,002	(5,441)
Excess tax expense (benefits) from exercise of employee stock options / vesting of restricted stock		292	351
Income tax receivable	79,166	(17,986)	(58,981)
Other liabilities	(6,941)	3,074	(343)
Accrued expenses	12,477	7,683	(3,322)
Net cash provided by operating activities	279,455	49,383	89,205
Cash flows from investing activities:
Purchase of property and equipment	(221,839)	(63,579)	(43,367)
Proceeds from sale of assets	20,843	2,521	4,134
Change in restricted cash		14,123	(14,123)
Payments for other long-term assets	(624)	(666)	(1,692)
Payments for businesses, net of cash acquired	(218,347)	(50,278)	(7,816)
Net cash used in investing activities	(419,967)	(97,879)	(62,864)
Cash flows from financing activities:
Proceeds from debt	498,850		241,697
Payments of debt	(278,696)	(28,253)	(239,543)
Premium on retirement of 11.625% senior secured notes	(36,179)
Purchase of treasury stock	(1,872)	(359)	(6,151)
Excess tax benefits (expense) from exercise of employee stock options / vesting of restricted stock		(292)	(351)
Tax withholding from exercise of stock options	(3,175)	(108)	(5)
Exercise of employee stock options	7,709	430	38
Deferred loan costs and other financing activities	(15,585)	(361)	(7,804)
Net cash provided by or (used) in financing activities	171,052	(28,943)	(12,119)
Net increase (decrease) in cash and equivalents	30,540	(77,439)	14,222
Cash and cash equivalents - beginning of year	47,918	125,357	111,135
Cash and cash equivalents - end of year	$ 78,458	$ 47,918	$ 125,357