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Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues and expenses under collaborative arrangement      
ETF advisory fee revenue $ 84,024 $ 64,366 $ 40,567
Expenses:      
Fund management and administration 23,020 19,882 14,286
Marketing and advertising 5,363 4,475 3,721
Sales and business development 3,586 3,603 2,730
Third party expenses 73,768 62,068 49,161
Net profit 11,030 3,092 (7,549)
Third Party Sharing Arrangements [Member]
      
Revenues and expenses under collaborative arrangement      
ETF advisory fee revenue 10,968 12,596 6,578
Expenses:      
Fund management and administration 1,341 1,712 1,057
Marketing and advertising 39 406 809
Sales and business development 24 159 196
Other   1 4
Third party expenses 1,404 2,278 2,066
Net profit 9,564 10,318 4,512
Sharing $ 4,662 $ 5,114 $ 2,256