Commitments and Contingencies (Narrative) (Details)			1 Months Ended		6 Months Ended	1 Months Ended
	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jan. 31, 2011 GTL Injunction Marange [Member] GBP (£)	Oct. 31, 2010 GTL Injunction Marange [Member] GBP (£)	Jun. 30, 2011 GTL Injunction Marange [Member] GBP (£)	Mar. 31, 2009 GTL Injunction - FG Hemisphere [Member] USD ($)
Legal matter settlements			£ 5,000,000	£ 14,500,000		$ 108,300,000
Amount enjoined by GTL under the Long Term Slag Sales Agreement after additional claims					19,500,000
Amount of Arbitration Awards accrued	81,105,000	68,096,000
Income from insurance recovery related to environmental remediation	$ 1,200,000