CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities:
Net income (loss)	$ 88,190	$ (11,692)
Amounts to reconcile net income (loss) to net cash flows provided by operating activities:
Loss from discontinued operations, net of taxes	181
Income from unconsolidated companies	(10)	(109)
Impairment and other charges	1,908	21,287
Benefit for deferred income taxes	(76,884)	(1,601)
Depreciation and amortization	88,979	93,389
Amortization of deferred financing costs	4,057	3,829
Amortization of discount on convertible notes	10,544	10,200
Write-off of deferred financing costs	1,845
Loss on extinguishment of debt	4,181
Stock-based compensation expense	6,406	5,108
Excess tax benefit from stock-based compensation	(7)
Changes in:
Trade receivables	2,597	(18,430)
Interest receivable	2,454	1,869
Income tax receivable	(7,113)
Accounts payable and accrued liabilities	(63,300)	29,498
Other assets and liabilities	178	(4,082)
Net cash flows provided by operating activities-continuing operations	64,206	129,266
Net cash flows provided by operating activities-discontinued operations	94	47
Net cash flows provided by operating activities	64,300	129,313
Cash Flows from Investing Activities:
Purchases of property and equipment	(23,584)	(78,189)
Collection of notes receivable	1,740	4,480
Increase in restricted cash and cash equivalents	(12,347)
Other investing activities	227	851
Net cash flows used in investing activities-continuing operations	(33,964)	(72,858)
Net cash flows used in investing activities-discontinued operations
Net cash flows used in investing activities	(33,964)	(72,858)
Cash Flows from Financing Activities:
Net borrowings (repayments) under credit facility	(12,000)	65,000
Issuance of senior notes	350,000
Early redemption of senior notes	(152,180)
Repurchase and conversion of convertible notes	(99,222)
Deferred financing costs paid	(15,516)	(376)
Proceeds from issuance of common stock, net of issuance cost of $1,131		32,722
Repurchase of Company stock for retirement	(100,028)	(185,400)
Payment of dividend	(51,162)
Proceeds from exercise of stock option and purchase plans	5,206	12,005
Excess tax benefit from stock-based compensation	7
Other financing activities, net	(521)	(564)
Net cash flows used in financing activities-continuing operations	(75,416)	(76,613)
Net cash flows provided by financing activities-discontinued operations
Net cash flows used in financing activities	(75,416)	(76,613)
Net change in cash and cash equivalents	(45,080)	(20,158)
Cash and cash equivalents at beginning of period	97,170	44,388
Cash and cash equivalents at end of period	$ 52,090	$ 24,230