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Financial Instruments (Details 2)
12 Months Ended
Dec. 31, 2012
Commodity Hedges Contract Fourteen [Member]
 
Summary of commodity swaps oustanding  
Inception Date Jan. 27, 2010
Commencement Date Feb. 01, 2010
Termination Date Jan. 31, 2012
Transaction Hedged OCC
Notional Amount (in short tons per month) 1,000
Contract Price Per Short Ton 90.00
Commodity Hedges Contract Seventeen [Member]
 
Summary of commodity swaps oustanding  
Inception Date Oct. 11, 2010
Commencement Date Jan. 01, 2011
Termination Date Dec. 31, 2012
Transaction Hedged OCC
Notional Amount (in short tons per month) 1,500
Contract Price Per Short Ton 115.00