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Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Schedule of Related Party Transactions        
Sub-advisory investment management fees $ 398 $ 657 $ 1,786 $ 2,274
Distribution and administration expenses 0 6 6 124
Total fees and expenses related to BMO Asset Management Corp. $ 398 $ 663 $ 1,792 $ 2,398