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Impairment Loss and Property Held for Sale Impairment Loss and Property Held for Sale (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Impairment loss and property held for sale [Abstract]    
Impairment loss $ 0us-gaap_AssetImpairmentCharges $ 2,914us-gaap_AssetImpairmentCharges