Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (186,561)	$ 10,467
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	181,488	157,975
Goodwill impairment	81,877
Accretion on asset retirement obligation	99	98
Change in allowance for doubtful accounts	261	(1,449)
Amortization of deferred financing costs	2,831	2,411
Amortization of premium on notes	(194)	(179)
Non-cash compensation	10,537	10,932
Loss on disposal of assets	1,119	1,216
Deferred income taxes	(101,366)	6,038
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	122,234	(56,525)
Inventories	5,658	(8,840)
Income tax receivable	(804)	(3,080)
Prepaid expenses and other current assets	(1,729)	(16,354)
Other assets	(535)	(565)
Accounts payable	(3,687)	10,670
Other liabilities	4,133	11,524
Accrued expenses	(23,898)	1,285
Net cash provided by operating activities	93,071	131,784
Cash flows from investing activities:
Purchase of property and equipment	(47,288)	(184,925)
Proceeds from sale of assets	7,558	36,350
Payments for other long-term assets		(879)
Payments for businesses, net of cash acquired	(16,730)	(16,090)
Net cash used in investing activities	(56,460)	(165,544)
Cash flows from financing activities:
Payments of debt	(55,367)	(34,225)
Proceeds from debt		16,000
Purchase of treasury stock	(4,626)	(6,315)
Tax withholding from exercise of stock options	(3)	(362)
Exercise of employee stock options	727	4,646
Deferred loan costs and other financing activities	(1,285)	(66)
Net cash used in financing activities	(60,554)	(20,322)
Net decrease in cash and equivalents	(23,943)	(54,082)
Cash and cash equivalents - beginning of period	79,915	111,532
Cash and cash equivalents - end of period	$ 55,972	$ 57,450