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Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenues and expenses under collaborative arrangement        
ETF advisory fee revenue $ 21,440 $ 17,554 $ 60,645 $ 48,341
Expenses:        
Fund management and administration 5,671 5,093 16,677 14,991
Marketing and advertising 862 911 3,736 3,240
Sales and business development 831 954 2,533 2,612
Third party expenses 17,128 16,377 55,447 46,782
Net profit 4,533 1,359 5,777 2,203
Third Party Sharing Arrangements [Member]
        
Revenues and expenses under collaborative arrangement        
ETF advisory fee revenue 2,616 3,882 8,139 9,653
Expenses:        
Fund management and administration 311 381 987 1,073
Marketing and advertising 14 41 33 389
Sales and business development 7 69 17 115
Third party expenses 332 491 1,037 1,577
Net profit 2,284 3,391 7,102 8,076
Sharing $ 1,113 $ 1,696 $ 3,455 $ 4,038