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Sale of Properties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sale of Properties [Abstract]      
Proceeds from Sale of Property, Plant, and Equipment $ 3 $ 8,307 $ 38
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ (8) $ (142) $ 4