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Impairment Charges and Other Impairment Charges and Other (Notes)
9 Months Ended
Sep. 30, 2016
Asset Impairment Charges [Abstract]  
Asset Impairment Charges
4.
Impairment Charges and Other

In the first quarter of 2015, we entered into a plan to sell our two aircraft, and as a result, we recorded impairment and other charges of $9.8 million, representing the difference between the carrying value and the estimated fair value of the assets as well as a provision for potential settlement of a Texas sales and use tax assessment. The fair value of assets held for sale of $13.5 million was determined based on the estimated selling price less costs incurred to sell and was classified as Level 2 in the fair value hierarchy. In July 2015, we received proceeds, net of selling costs, of $12.2 million for both aircraft and recorded an additional $1.3 million impairment charge in the second quarter of 2015. In the first quarter of 2016, we settled the Texas sales and use tax assessment.