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Disclosure - SUBSEQUENT EVENT (Details) (Subsequent event, Kaz USA, MBFC Bonds, USD $)
In Millions, unless otherwise specified
1 Months Ended
Mar. 31, 2013
SUBSEQUENT EVENTS  
Outstanding principal payable on March 1, 2014 $ 1.90
Outstanding principal payable on March 1, 2015 1.90
Outstanding principal payable on March 1, 2016 3.80
Outstanding principal payable on March 1, 2017 5.70
Outstanding principal payable on March 1, 2018 1.90
Outstanding principal payable on March 1, 2019 1.90
Outstanding principal payable on March 1, 2020 1.90
Outstanding principal payable on March 1, 2021 1.90
Outstanding principal payable on March 1, 2022 1.90
Outstanding principal payable on March 1, 2023 15.20
Period following completion of the facility when debt may be prepaid in whole or part 6 months
After March 1, 2018
 
SUBSEQUENT EVENTS  
Notice period for prepayment of debt by Bank of America, N.A. 90 days
Base Rate Loan | LIBOR
 
SUBSEQUENT EVENTS  
Variable Rate Basis one, two, three, or six-month LIBOR
Margin (as a percent) 1.00%
Base Rate Loan | Federal Funds Rate
 
SUBSEQUENT EVENTS  
Variable Rate Basis federal funds
Margin (as a percent) 0.50%
Base Rate Loan | Bank of America's prime rate
 
SUBSEQUENT EVENTS  
Variable Rate Basis prime rate of Bank of America
Eurodollar Rate Loan | LIBOR
 
SUBSEQUENT EVENTS  
Variable Rate Basis one, two, three, or six-month LIBOR
Minimum | LIBOR
 
SUBSEQUENT EVENTS  
Margin (as a percent) 1.00%
Minimum | Base Rate Loan | Base rate
 
SUBSEQUENT EVENTS  
Margin (as a percent) 0.00%
Maximum
 
SUBSEQUENT EVENTS  
Face amount $ 38.00
Maximum | LIBOR
 
SUBSEQUENT EVENTS  
Margin (as a percent) 2.125%
Maximum | Base Rate Loan | Base rate
 
SUBSEQUENT EVENTS  
Margin (as a percent) 1.125%