Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net (loss) income	$ 19,655	$ (7,711)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Provision for doubtful accounts	1,999	2,233
Share-based payment	1,117	1,036
Depreciation and amortization	48,682	58,659
Amortization of deferred financing costs	1,440	2,559
Accretion of discount on long-term debt	334	890
Adjustment of derivatives to fair value	269	587
Distributions (less) more than undistributed earnings from investees	581	(81)
Deferred income taxes	1,161	(10,370)
Gain on sale of assets	(559)	(1,582)
Loss on extinguishment of debt	0	(22,201)
Impairment charges	240	9,396
Excess tax benefit from share-based payment arrangements	(585)	0
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	(2,331)	(3,437)
Prepaid expenses	(806)	(2,061)
Other receivables	351	1,444
Other assets	(768)	157
Accounts payable	451	(1,375)
Accrued compensation and related expenses	(4,497)	(4,147)
Accrued interest payable	1,489	(111)
Income taxes payable	6	0
Other accrued liabilities	763	(3,168)
Net cash provided by operating activities	68,992	65,119
Investing activities:
Equipment purchases	(23,194)	(19,096)
Decrease (increase) in deposits on equipment	(3,290)	675
Acquisitions, net of cash received	(1,529)	0
Increase in cash in escrow	0	496
Proceeds from sale of assets	985	3,083
Net cash used in investing activities	(27,028)	(15,834)
Financing activities:
Principal payments on equipment debt	(8,005)	(10,819)
Proceeds from equipment debt	3,843	4,845
Proceeds from term loan facility	0	417,900
Principal payments on term loan facility	(3,675)	(341,485)
Principal payments on revolving loan facility	(37,000)	0
Proceeds from revolving loan facility	18,000	0
Principal payments on senior subordinated notes	0	88,772
Payments of debt issuance costs	0	(13,035)
Noncontrolling interest in subsidiaries	(11,246)	(9,229)
Equity purchase of noncontrolling interest	(691)	0
Excess tax benefit from share-based payment arrangements	585	0
Proceeds from shared-based payment arrangements	466	402
Purchase of treasury stock	(140)	0
Net cash used in financing activities	(37,863)	(40,193)
Net increase in cash and cash equivalents	4,101	9,092
Cash and cash equivalents, beginning of period	34,702	39,977
Cash and cash equivalents, end of period	38,803	49,069
Supplemental disclosure of cash flow information:
Interest paid	15,465	25,661
Income taxes paid, net of refunds	5,974	2,115
Supplemental disclosure of non-cash investing and financing activities:
Net book value of assets exchanged	0	5
Comprehensive loss from hedging transactions, net of taxes	165	426
Equipment purchases in accounts payable	1,225	1,327
Adjustment to equity of noncontrolling interest	1,700	0
Debt related to purchase of equipment	$ 2,112	$ 0