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OTHER INCOME ITEMS - Other Income (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
Partial condemnation of land, Greenwood Village, Colorado  
Consideration received from the CDOT of a partial condemnation of land and easements $ 484,000
Consideration to be received from the CDOT for easements 25,000
Aggregate consideration amount 509,000
Amount from the CDOT attributable to the easements 356,000
Amount from the CDOT attributable to the partial condemnation of land 153,000
Other Income  
Consideration received from the CDOT of a partial condemnation of land and easements 484,000
Consideration to be received from the CDOT for easements 25,000
Aggregate consideration amount 509,000
Amount from the CDOT attributable to the easements 356,000
Amount from the CDOT attributable to the partial condemnation of land $ 153,000