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Notes Payable Level 4 (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Convertible Debt Issued in 2010 [Member]
Dec. 31, 2012
Convertible Debt Issued in 2010 [Member]
Mar. 31, 2013
Convertible Debt Issued in 2009 [Member]
Dec. 31, 2012
Convertible Debt Issued in 2009 [Member]
Mar. 31, 2013
Convertible Debt Issued in 2004 [Member]
Dec. 31, 2012
Convertible Debt Issued in 2004 [Member]
Mar. 31, 2013
Convertible Debt Issued 2009 [Member]
Mar. 31, 2013
Line of Credit 2011 [Member]
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Effective Percentage     8.90%       8.50%   11.90%  
Line of Credit Facility, Amount Outstanding                   $ 0
Debt Instrument, Convertible, Interest Expense 7,200,000 7,000,000                
Principal Amount of Convertible Senior Notes Payable at Issuance     200,000,000              
Long-term Debt, Gross       200,000,000 115,839,000 115,839,000 28,243,000 28,243,000    
Debt Instrument, Unamortized Discount     (20,151,000) (21,944,000) (10,888,000) (12,269,000) 0 0    
Convertible Debt     179,849,000 178,056,000 104,951,000 103,570,000 28,243,000 28,243,000    
Debt Instrument, Convertible, Carrying Amount of Equity Component         15,586,000 15,586,000 22,637,000 22,637,000    
Debt Instrument, Convertible, If-converted Value in Excess of Principal     $ 41,065,000 $ 0 $ 64,395,000 $ 30,382,000 $ 2,364,000 $ 0    
Debt Instrument, Convertible, Conversion Price         $ 9.57   $ 13.74