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Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Related Party Transactions (Textual) [Abstract]        
Sub-advisory investment management fees $ 666 $ 778 $ 1,388 $ 1,617
Distribution and administration expenses   41 6 118
Total fees and expenses related to BMO Asset Management Inc. $ 666 $ 819 $ 1,394 $ 1,735