Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows from Operating Activities:
Net income (loss)	$ 10,177	$ (89,128)	$ (23)
Amounts to reconcile net income (loss) to net cash flows provided by operating activities:
(Gain) loss from discontinued operations, net of taxes	(109)	(3,070)	7,137
(Income) loss from unconsolidated companies	(1,086)	(608)	5
Loss on sales of long-lived assets	916	1,239	828
Provision (benefit) for deferred income taxes	5,399	(2,569)	37,272
Depreciation and amortization	125,289	105,561	116,567
Amortization of deferred financing costs	5,118	5,314	4,762
Amortization of discount on convertible notes	12,695	11,687	2,864
Write-off of deferred financing costs related to refinancing of credit facility	1,681
Stock-based compensation expense	10,170	10,062	9,982
Net gain on extinguishment of debt		(1,299)	(18,677)
Loss on assets damaged in flood	332	44,970
Changes in (net of acquisitions and divestitures):
Trade receivables	(10,146)	8,071	8,957
Interest receivable	(334)	(285)	(14,807)
Income tax receivable	2,869	27,301	(24,146)
Accounts payable and accrued liabilities	(4,062)	16,298	(4,689)
Other assets and liabilities	(5,005)	5,366	(1,022)
Net cash flows provided by operating activities - continuing operations	153,904	138,910	125,010
Net cash flows provided by (used in) operating activities - discontinued operations	15	574	(1,951)
Net cash flows provided by operating activities	153,919	139,484	123,059
Cash Flows from Investing Activities:
Purchases of property and equipment	(132,592)	(194,647)	(53,065)
Collection of notes receivable	2,465	4,161	17,621
Other investing activities	1,848	148	1,955
Net cash flows used in investing activities - continuing operations	(128,279)	(190,338)	(33,489)
Net cash flows used in investing activities - discontinued operations		(1,460)	(6)
Net cash flows used in investing activities	(128,279)	(191,798)	(33,495)
Cash Flows from Financing Activities:
Repayments under credit facility	(100,000)		(22,500)
Repurchases of senior notes		(26,965)	(329,571)
Proceeds from the issuance of convertible notes, net of equity-related issuance costs of $1,881			358,107
Deferred financing costs paid	(10,074)		(8,077)
Purchase of convertible note hedge			(76,680)
Proceeds from issuance of common stock warrants			43,740
Proceeds from issuance of common stock, net of issuance cost of $5,499			125,297
Purchases of treasury stock			(4,599)
Proceeds from the termination of an interest rate swap on senior notes			5,000
Proceeds from exercise of stock option and purchase plans	4,828	26,075	566
Decrease in restricted cash and cash equivalents			15
Other financing activities, net	(404)	(2,427)	(1,869)
Net cash flows provided by (used in) financing activities - continuing operations	(105,650)	(3,317)	89,429
Net cash flows used in financing activities - discontinued operations	0	0	0
Net cash flows provided by (used in) financing activities	(105,650)	(3,317)	89,429
Net change in cash and cash equivalents	(80,010)	(55,631)	178,993
Cash and cash equivalents - unrestricted, beginning of period	124,398	180,029	1,036
Cash and cash equivalents - unrestricted, end of period	$ 44,388	$ 124,398	$ 180,029