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Summary of Significant Accounting Policies (Held-to-Maturity Securities) (Details) (Banco Santander Bonds [Member], USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Mar. 23, 2012
Banco Santander Bonds [Member]
      
Schedule of Held-to-maturity Securities [Line Items]      
Held-to-maturity securities, Premium Paid     $ 200,000
Cash Received for Held-to-Maturity Securities Sold 20,009,000    
Premium on held-to-maturity securities 20,042,000    
Accrued Investment Income Receivable     500,000
Interest income rate (as a percent)   2.875%  
Loss On Held-to-maturity Securities Sold $ (33,000)