CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net income (loss)	$ 14,800	$ (1,203)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	13,793	15,790
Stock-based compensation expense	3,078	3,419
Deferred income taxes	348	5,693
Adjustment of interest rate swap to fair value		264
Loss on sale of investments		2,699
Gain on sale of property and equipment	(76)	(79)
Other long-term liabilities	1,851	214
Other non-cash items	(197)	767
Changes in other components of working capital	(118,052)	(52,602)
NET CASH USED IN OPERATING ACTIVITIES	(84,455)	(25,038)
Cash Flows from Investing Activities:
Acquisition of property and equipment	(12,179)	(10,649)
Proceeds from sale of property and equipment	239	3,968
Investments in available-for-sale securities		(535)
Proceeds from sale of available-for-sale securities		16,553
Change in restricted cash	(6,514)	(13)
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES	(18,454)	9,324
Cash Flows from Financing Activities:
Proceeds from debt	293,014	98,500
Repayment of debt	(225,684)	(95,107)
Business acquisition related payments		(1,188)
Issuance of common stock and effect of cashless exercise	(159)	(307)
Debt issuance costs		(10)
NET CASH PROVIDED BY FINANCING ACTIVITIES	67,171	1,888
Net Decrease in Cash and Cash Equivalents	(35,738)	(13,826)
Cash and Cash Equivalents at Beginning of Year	168,056	204,240
Cash and Cash Equivalents at End of Period	132,318	190,414
Supplemental Disclosure of Cash Paid (Received) For:
Interest	5,107	3,320
Income taxes	(2,902)	781
Supplemental Disclosure of Non-cash Transactions:
Property and equipment acquired through financing arrangements		2,050
Grant date fair value of common stock issued for services	$ 439	$ 1,421