CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities:
Net income (loss)	$ (11,692)	$ 5,074
Amounts to reconcile net income (loss) to net cash flows provided by operating activities:
Income from discontinued operations, net of taxes		(61)
Income from unconsolidated companies	(109)	(1,086)
Impairment and other charges	21,287
Loss on disposals of long-lived assets		189
Provision (benefit) for deferred income taxes	(1,601)	2,474
Depreciation and amortization	93,389	90,695
Amortization of deferred financing costs	3,829	3,896
Amortization of discount on convertible notes	10,200	9,389
Write-off of deferred financing costs related to refinancing of credit facility		1,681
Stock-based compensation expense	5,108	7,422
Changes in:
Trade receivables	(18,430)	(18,078)
Interest receivable	1,869	2,435
Accounts payable and accrued liabilities	29,498	(7,325)
Other assets and liabilities	(4,082)	(13,800)
Net cash flows provided by operating activities - continuing operations	129,266	82,905
Net cash flows provided by operating activities - discontinued operations	47	16
Net cash flows provided by operating activities	129,313	82,921
Cash Flows from Investing Activities:
Purchases of property and equipment	(78,189)	(93,844)
Collection of notes receivable	4,480	2,465
Other investing activities	851	2,202
Net cash flows used in investing activities - continuing operations	(72,858)	(89,177)
Net cash flows used in investing activities - discontinued operations
Net cash flows used in investing activities	(72,858)	(89,177)
Cash Flows from Financing Activities:
Net borrowings (repayments) under credit facility	65,000	(100,000)
Deferred financing costs paid	(376)	(10,074)
Proceeds from issuance of common stock, net of issuance cost of $1,131	32,722
Repurchase of Company stock for retirement	(185,400)
Proceeds from exercise of stock option and purchase plans	12,005	4,275
Other financing activities, net	(564)	(221)
Net cash flows used in financing activities - continuing operations	(76,613)	(106,020)
Net cash flows provided by financing activities - discontinued operations
Net cash flows used in financing activities	(76,613)	(106,020)
Net change in cash and cash equivalents	(20,158)	(112,276)
Cash and cash equivalents - unrestricted, beginning of period	44,388	124,398
Cash and cash equivalents - unrestricted, end of period	$ 24,230	$ 12,122