Income Taxes (Details Textual) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2009
Income Taxes (Textual) [Abstract]
Deferred state income tax provision, Impact of state income tax law change			$ (3,100,000)
Provision at Federal rate			35.00%
Undistributed Earnings of Foreign Subsidiaries			23,000,000
Deferred income tax assets related to state income tax jurisdictions			2,300,000
Deferred Tax Assets Foreign Jurisdictions Income Tax			39,000,000
Valuation allowances against deferred income tax assets state income tax jurisdictions			1,500,000
Valuation allowances against deferred income tax assets foreign income tax jurisdictions			21,000,000
Cash payments related to the deferred income tax liabilities associated with the 2004 Convertible Debt Securities	6,000,000	6,000,000	29,000,000
Deferred Tax Liabilities Payment Period			5 years
Liability for unrecognized tax benefits	4,114,000		4,029,000	954,000	4,131,000
Income tax related to accrued interest	100,000		200,000	100,000
Unrecognized tax benefits that would impact effective tax rate			4,000,000
Deferred income tax assets benefits percentage			100.00%
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
U.S. Federal Net operating loss carryforward	51,000,000		50,000,000
Operating Loss Carryforwards, Expiration Dates			begin to expire in 2019 and can be utilized through 2030
Interest rate used for tax deduction			9.09%
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
U.S. Federal Net operating loss carryforward	57,000,000		89,000,000
Operating Loss Carryforwards, Expiration Dates			2015
State And Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
U.S. Federal Net operating loss carryforward	$ 67,000,000		$ 54,000,000
Operating Loss Carryforwards, Expiration Dates			will expirebeginning in 2013 and end in 2030