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Operating Leases (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) AircraftEngine | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) AircraftEngine | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease costs | $ 22,000 | $ 22,100 | $ 43,500 | $ 44,100 |
Number of aircraft engines | AircraftEngine | 32 |  | 32 |  |
Net book value of aircraft engines | $ 1,155,121 |  | $ 1,155,121 |  | $ 372,939
Lease income | $ 5,100 |  | $ 13,300 |  |
Operating Lease, Income, Comprehensive Income [Extensible List] | us-gaap:OtherIncomeMember |  | us-gaap:OtherIncomeMember |  |
Aircraft Engines [Member] |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Net book value of aircraft engines | $ 306,500 |  | $ 306,500 |  |

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77888421&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=109225645&loc=SL77927221-108306 + Details
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