Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011		Sep. 30, 2011		Sep. 30, 2010	Dec. 31, 2010
Income Taxes [Line Items]
Income tax benefit	$ (6,245,000)		$ (19,055,000)
Reduction in liability for unrecognized tax benefit			3,600,000
Unrecognized tax benefit	3,408,000	[1]	3,408,000	[1]		10,261,000	[1]
Allocation of tax benefit to continuing operations	23,900,000		23,900,000
Decrease in liability for unrecognized tax benefits			(6,853,000)		196,000
Decrease in accrued liability for interest, for unrecognized tax benefits	1,200,000		1,200,000
Decrease in accrued liability for penalties, for unrecognized tax benefits	500,000		500,000
Unrecognized tax benefits, increase recorded to other income, net			1,700,000
Deferred tax asset that expects to benefit in the current year	15,500,000		15,500,000
Valuation allowance against its deferred income tax assets except for the deferred tax assets	2,700,000		2,700,000			4,200,000
4.75% Convertible Senior Notes Due On 2018 [Member]
Income Taxes [Line Items]
Income tax benefit			15,500,000
Capital in excess of par value account	$ 34,427,000		$ 34,427,000

[1] See Note 15 to the Company's consolidated financial statements for further discussion of unrecognized tax benefits.