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Other Income Items - Other Income (Details) - Partial condemnation of land, Greenwood Village, Colorado
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Consideration received from the CDOT of a partial condemnation of land and easements   $ 466,000
Consideration to be received from the CDOT for easements $ 43,000 43,000
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 466,000  
Consideration to be received from the CDOT for easements 43,000 43,000
Aggregate consideration amount 509,000 509,000
Amount from the CDOT attributable to the easements 356,000 356,000
Amount from the CDOT attributable to the partial condemnation of land $ 153,000 $ 153,000