Asset Disposals	9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Asset Disposals	ASSET DISPOSALS During the first quarter of 2018, we disposed of one light aircraft previously utilized in the Air Medical segment and donated to a charitable organization one aircraft previously used in our Oil and Gas segment. During the second quarter of 2018, we disposed of one medium and one light aircraft previously utilized in the Oil & Gas segment. During the third quarter of 2018, we disposed of one medium aircraft previously utilized in the Oil & Gas segment. These aircraft no longer met our strategic needs. Aggregate cash proceeds totaled $1.5 million, resulting in a $0.7 million loss on the disposal of these assets. There were no sales or disposals of aircraft during the first quarter of 2017. During the second quarter of 2017, we disposed of five medium aircraft. During the third quarter of 2017, we disposed of one medium aircraft and related parts inventory utilized in the Oil and Gas segment. These aircraft no longer met our strategic needs.

ASSET DISPOSALS

During the first quarter of 2018, we disposed of one light aircraft previously utilized in the Air Medical segment and donated to a charitable organization one aircraft previously used in our Oil and Gas segment. During the second quarter of 2018, we disposed of one medium and one light aircraft previously utilized in the Oil & Gas segment. During the third quarter of 2018, we disposed of one medium aircraft previously utilized in the Oil & Gas segment. These aircraft no longer met our strategic needs. Aggregate cash proceeds totaled $1.5 million, resulting in a $0.7 million loss on the disposal of these assets.

There were no sales or disposals of aircraft during the first quarter of 2017. During the second quarter of 2017, we disposed of five medium aircraft. During the third quarter of 2017, we disposed of one medium aircraft and related parts inventory utilized in the Oil and Gas segment. These aircraft no longer met our strategic needs.