Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income (loss)	$ 10,467	$ (28,530)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	157,975	155,471
Accretion on asset retirement obligation	98	83
Change in allowance for doubtful accounts	(1,449)	779
Amortization of deferred financing costs	2,411	2,300
Amortization of premium on notes	(179)	(166)
Non-cash compensation	10,932	8,966
Loss on disposal of assets	1,216	2,290
Deferred income taxes	6,038	(15,414)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(56,525)	(3,584)
Inventories	(8,840)	1,938
Prepaid expenses and other current assets	(16,354)	(4,106)
Other assets	(565)	81
Accounts payable	10,670	(12,296)
Income tax receivable / payable	3,080	(976)
Other liabilities	11,524	2,763
Accrued expenses	1,285	(2,445)
Net cash provided by operating activities	131,784	107,154
Cash flows from investing activities:
Purchase of property and equipment	(184,925)	(104,029)
Proceeds from sale of mutual fund		5,635
Proceeds from sale of assets	36,350	11,542
Payments for other long-term assets	(879)	(808)
Payments for businesses, net of cash acquired	(16,090)	(16,267)
Net cash used in investing activities	(165,544)	(103,927)
Cash flows from financing activities:
Payments of debt	(34,225)	(33,868)
Proceeds from debt	16,000
Purchase of treasury stock	(6,315)	(3,562)
Tax withholding from exercise of stock options	(362)	(154)
Exercise of employee stock options	4,646	456
Deferred loan costs and other financing activities	(66)	(495)
Net cash used in financing activities	(20,322)	(37,623)
Net decrease in cash and equivalents	(54,082)	(34,396)
Cash and cash equivalents - beginning of period	111,532	134,565
Cash and cash equivalents - end of period	$ 57,450	$ 100,169