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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS We implemented a reduction in force in 2019 that will cause us to incur approximately $4.7 million of expense in the first quarter and approximately $1.2 million of expense in the second quarter. This action also resulted in a partial termination of AMR’s 401(k) savings plan, which will accelerate vesting for those employees that were impacted by the reduction in force to the extent they were not already vested in our matching contributions.