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v3.19.3.a.u2

Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) aircraft | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2016 USD ($)
Summary of Significant Accounting Policies |  |  |  |  |
Number of aircraft owned | aircraft | 292 |  |  |  |
Number of aircraft on order with manufacturers | aircraft | 413 |  |  |  |
Number of aircraft purchase options with manufacturers | aircraft | 70 |  |  |  |
Cash, cash equivalents and restricted cash |  |  |  |  |
Cash and cash equivalents | $ 317,488 | $ 300,127 |  |  |
Restricted cash | 20,573 | 22,871 |  |  |
Total cash, cash equivalents and restricted cash in the consolidated statements of cash flows | $ 338,061 | 322,998 | $ 308,282 |  | $ 290,802
Flight equipment |  |  |  |  |
Useful life | 25 years |  |  |  |
Residual value (as a percent) | 15.00% |  |  |  |
Maintenance Rights |  |  |  |  |
Maintenance right liabilities | $ 0 |  |  |  |
Payments for Flight Equipment | $ 3,663,605 | $ 2,512,582 | $ 1,972,009 |  |
Income taxes |  |  |  |  |
Probability threshold of realization of full value of the asset for recording of valuation allowance for deferred tax assets (as a percent) | 50.00% |  |  |  |
Blackbird I |  |  |  |  |
Investments |  |  |  |  |
Percentage of equity ownership | 9.50% |  |  |  |
Blackbird II |  |  |  |  |
Investments |  |  |  |  |
Percentage of equity ownership | 9.50% |  |  |  |
Thunderbolt II |  |  |  |  |
Investments |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 5.00% |  |  |  |
Assets Leased to Others |  |  |  |  |
Maintenance Rights |  |  |  |  |
Number of aircraft purchased | aircraft | 0 | 2 |  |  |
Total cost |  | $ 73,300 |  |  |
Aircraft Improvement Assets |  |  |  |  |
Maintenance Rights |  |  |  |  |
Number of aircraft purchased | aircraft | 2 | 9 |  |  |
Maintenance Right Assets |  |  |  |  |
Maintenance Rights |  |  |  |  |
Accumulated depreciation | $ 37,200 | $ 46,400 |  |  |
Total cost |  | $ 13,200 |  |  |
ASU 2016-02 |  |  |  |  |
Investments |  |  |  |  |
Operating ROU lease assets |  |  |  | $ 44,600 |
Lease obligations |  |  |  | $ 51,200 |

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