CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows from Operating Activities:
Net (Loss) Income	$ (1,203)	$ 6,929
Adjustments to reconcile Net (Loss) Income to net cash from operating activities:
Depreciation and amortization	15,790	8,043
Stock-based compensation expense	3,419	3,615
Excess income tax benefit from stock-based compensation	0	(18)
Deferred income taxes	5,693	(411)
Loss on sale of investments	2,699	0
Loss (gain) on sale of equipment	(79)	596
Other long-term liabilities	214	(243)
Other non-cash items	1,031	64
Changes in other components of working capital	(52,602)	(66,229)
NET CASH USED IN OPERATING ACTIVITIES	(25,038)	(47,654)
Cash Flows from Investing Activities:
Acquisitions, net of cash balance acquired	0	(70,620)
Business acquisition related payments	(1,188)	(3,000)
Acquisition of property and equipment	(10,649)	(8,932)
Proceeds from sale of property and equipment	3,968	893
Investments in available-for-sale securities	(535)	0
Proceeds from sale of available-for-sale securities	16,553	0
Change in restricted cash	(13)	(8)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	8,136	(81,667)
Cash Flows from Financing Activities:
Proceeds from debt	98,500	58,175
Repayment of debt	(95,107)	(33,119)
Excess income tax benefit from stock-based compensation	0	18
Issuance of common stock and effect of cashless exercise	(307)	0
Debt issuance costs	(10)	(25)
NET CASH PROVIDED BY FINANCING ACTIVITIES	3,076	25,049
Net Decrease in Cash and Cash Equivalents	(13,826)	(104,272)
Cash and Cash Equivalents at Beginning of Year	204,240	471,378
Cash and Cash Equivalents at End of Period	190,414	367,106
Supplemental Disclosure of Cash Paid During the Period For:
Interest	3,320	1,091
Income taxes	781	1,296
Supplemental Disclosure of Non-cash Transactions:
Property and equipment acquired through financing arrangements	2,050	1,604
Property and equipment additions accrued in accounts payable	0	3,331
Grant date fair value of common stock issued for services	$ 1,421	$ 717