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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies |
Schedule of Future Minimum Rental Payments for Operating Leases | The following table summarizes future minimum rental payments required under operating leases that have non‑cancelable lease terms as of December 31, 2017 (in thousands):
2018 |  | $ | 142,157 |
2019 |  |  | 104,297 |
2020 |  |  | 121,119 |
2021 |  |  | 112,657 |
2022 |  |  | 75,981 |
Thereafter |  |  | 160,621 |
|  | $ | 716,832 |
Schedule of Employees Under Collective Bargaining Agreements |
|  | Approximate |  |  |  |  |
|  | Number of |  |  |  |  |
|  | Active Employees |  |  |  | Status of |
Employee Group |  | Represented |  | Representatives |  | Agreement |
Atlantic Southeast Pilots |  | 669 |  | Air Line Pilots Association International |  | Amendable February 2018 |
Atlantic Southeast Flight Attendants |  | 552 |  | International Association of Machinists and Aerospace Workers |  | Currently Amendable |
Atlantic Southeast Flight Controllers |  | 25 |  | Transport Workers Union of America |  | Currently Amendable |
Atlantic Southeast Mechanics |  | 102 |  | International Brotherhood of Teamsters |  | Currently Amendable |
Atlantic Southeast Stock Clerks |  | 29 |  | International Brotherhood of Teamsters |  | Currently Amendable |
ExpressJet Delaware Pilots |  | 1111 |  | Air Line Pilots Association International |  | Amendable February 2018 |
ExpressJet Delaware Flight Attendants |  | 618 |  | International Association of Machinists and Aerospace Workers |  | Currently Amendable |
ExpressJet Delaware Mechanics |  | 418 |  | International Brotherhood of Teamsters |  | Amendable January 2019 |
ExpressJet Delaware Dispatchers |  | 22 |  | Transport Workers Union of America |  | Currently Amendable |
ExpressJet Delaware Stock Clerks |  | 42 |  | International Brotherhood of Teamsters |  | Currently Amendable |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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