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Related Person Transactions (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]      
Rental service charge $ 12,000 $ 12,000 $ 17,500
Purchase of maintenance and other services $ 254,000 $ 313,000 $ 298,000