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ASSET RETIREMENT OBLIGATIONS (Asset Retirement Obligations Operating Costs) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
ARO Operating Costs      
Accretion $ 10,685 $ 7,956 $ 8,195
Depreciation 3,527 5,599 7,242
Total $ 14,212 $ 13,555 $ 15,437