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Other Income (Expense) (Schedule of Other Income (Expense)) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Income and Expenses [Abstract]      
Change in fair value of warrants potentially settleable in cash $ (44,001) $ (10,775) $ 8,986
Realized gain on sale of marketable securities 3,911 0 0
Change in fair value of the contingent purchase price liability (926) (2,370) 109
Miscellaneous other income 37 0 (9)
Total other income (expense) $ (40,979) $ (13,145) $ 9,086