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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Abstract]    
Trade accounts payable $ 108,192 $ 75,949
Accrued wages, salaries and employee benefits 38,563 42,491
Accrued utilities 8,309 8,205
Accrued taxes other than income taxes payable 6,322 6,993
Accrued interest 9,691 5,242
Accrued discounts and allowances 6,410 4,785
Other 13,161 21,931
Accounts payable and accrued liabilities $ 190,648 $ 165,596