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Short-term Investments (Details)
12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
Loan Note Receivables Due from Financial Institutions [Member]
USD ($)
Dec. 31, 2012
Loan Note Receivables Due from Financial Institutions [Member]
EUR (€)
Dec. 31, 2011
Loan Note Receivables Due from Financial Institutions [Member]
USD ($)
Dec. 31, 2011
Loan Note Receivables Due from Financial Institutions [Member]
EUR (€)
Dec. 31, 2012
Investment Maturing 2013 [Member]
EUR (€)
Dec. 31, 2012
Investment Maturing 2014 [Member]
EUR (€)
Dec. 31, 2012
Term Deposits [Member]
USD ($)
Dec. 31, 2012
Term Deposits [Member]
EUR (€)
Dec. 31, 2011
Term Deposits [Member]
USD ($)
Dec. 31, 2011
Term Deposits [Member]
EUR (€)
Investment [Line Items]                          
Short-term investments $ 90,451,000 $ 54,577,000   $ 82,500,000 € 62,500,000 $ 45,300,000 € 35,000,000 € 47,500,000 € 15,000,000 $ 8,000,000 € 6,100,000 $ 9,300,000 € 7,200,000
Sales of short-term investments 5,999,000 242,630,000 44,000,000                    
Realized Investment Gains (Losses) $ 0 $ 0