Stockholders' Equity (Details) (USD $)	3 Months Ended	7 Months Ended	12 Months Ended		46 Months Ended	3 Months Ended			1 Months Ended	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2008	Dec. 31, 2010	Dec. 31, 2009	Mar. 31, 2012	Mar. 31, 2012 Molymet D	Mar. 31, 2012 Common Stock	Dec. 31, 2011 Common Stock	Feb. 29, 2012 Series A Mandatory Convertible Preferred Stock	Mar. 31, 2012 Series A Mandatory Convertible Preferred Stock	Dec. 31, 2011 Series A Mandatory Convertible Preferred Stock
Stockholders' Equity
Shares outstanding							96,396,043	83,896,043		2,070,000	2,070,000
Dividend rate (as a percent)										5.50%
Cash dividend declared (in dollars per share)									$ 1.375
Cash dividend declared and paid (in dollars)	$ 2,846,000				$ 11,861,000					$ 2,800,000
Issuance of shares for investment (in shares)						12,500,000
Issuance of shares for investment (in dollars)		92,000,000	15,000,000	18,004,000		390,100,000
Stock issuance costs			$ 29,200,000			$ 100,000
Price per share of common stock issued for investment		$ 2.37	$ 2.60	$ 4.68		$ 31.218
Number of consecutive trading days to calculate common stock price						20
Premium percentage added to common stock price						10.00%