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Subsequent Event (Details) (USD $)
In Millions
1 Months Ended9 Months Ended
Sep. 30, 2011
Oct. 19, 2011
New Credit Facility [Member]
Sep. 30, 2011
Senior Credit Facility [Member]
Subsequent Event [Line Items]   
Maximum borrowing capacity$ 240.0$ 430.0$ 240.0
Increase in borrowing capacity 75.0 
Maximum borrowing capacity upon increment 505.0 
Maturity date of debtOct. 19, 2016Dec. 20, 2012
Outstanding balance $ 165.9 
Debt instrument, interest rate terms 
Revolving borrowings under the New Credit Facility bear interest, at our option, at either of the following and in each case plus an applicable margin:

 
a.
a base rate, which is the highest of (i) the Wells Fargo Bank, National Association prime rate, (ii) the Federal Funds Rate plus 0.500% and (iii) the LIBOR Market Index Rate plus 1.000%; or
 
b.
the London Interbank Offered Rate (LIBOR).

Borrowings by the Canadian Borrower bear interest, at the Canadian Borrower’s option, at either of the following and in each case plus an applicable margin:

 
a.
a base rate, which is the greatest of (i) the Canadian Reference Bank prime rate, (ii) the annual rate of interest equal to the sum of the CDOR Rate plus 1.000% and (iii) the LIBOR Market Index Rate plus 1.000%; or
 
b.
LIBOR.

Borrowings by the Dutch Borrower bear interest at LIBOR plus an applicable margin.