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Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenues and expenses under collaborative arrangement    
ETF advisory fee revenue $ 29,153 $ 18,975
Expenses:    
Fund management and administration 8,223 5,439
Marketing and advertising 1,937 1,326
Sales and business development 1,801 860
Total third party expenses 21,487 18,055
Net profit 7,854 1,115
Third Party Sharing Arrangements [Member]
    
Revenues and expenses under collaborative arrangement    
ETF advisory fee revenue   2,790
Expenses:    
Fund management and administration   341
Marketing and advertising   10
Sales and business development   4
Total third party expenses   355
Net profit   2,435
Sharing   $ 1,195