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Notes Payable Level 4 (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]      
Repurchase Agreement, Maximum Amount Borrowed   $ 180,000,000  
Debt Instrument, Convertible, Interest Expense 28,500,000 31,600,000 20,900,000
Repurchase Agreement, Average Borrowings   12,900,000  
Repurchase Agreement, Average Interest Rate   0.23%  
Convertible Debt Issued in 2010 [Member]
      
Debt Instrument [Line Items]      
Principal Amount of Convertible Senior Notes Payable at Issuance 200,000,000    
Long-term Debt, Gross   200,000,000  
Debt Instrument, Unamortized Discount (21,944,000) (28,906,000)  
Convertible Debt 178,056,000 171,094,000  
Debt Instrument, Convertible, If-converted Value in Excess of Principal 0 0  
Convertible Debt Issued in 2009 [Member]
      
Debt Instrument [Line Items]      
Principal Amount of Convertible Senior Notes Payable at Issuance 115,800,000    
Long-term Debt, Gross 115,839,000 115,839,000  
Debt Instrument, Unamortized Discount (12,269,000) (17,568,000)  
Convertible Debt 103,570,000 98,271,000  
Debt Instrument, Convertible, Carrying Amount of Equity Component 15,586,000 15,586,000  
Debt Instrument, Convertible, If-converted Value in Excess of Principal 30,382,000 8,846,000  
Convertible Debt Issued in 2004 [Member]
      
Debt Instrument [Line Items]      
Principal Amount of Convertible Senior Notes Payable at Issuance 260,000,000    
Long-term Debt, Gross 28,243,000 28,243,000  
Debt Instrument, Unamortized Discount 0 0  
Convertible Debt 28,243,000 28,243,000  
Debt Instrument, Convertible, Carrying Amount of Equity Component 22,637,000 22,637,000  
Debt Instrument, Convertible, If-converted Value in Excess of Principal 0 0  
Line of Credit 2011 [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Amount Outstanding $ 0