Fair Value Measurements (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2023 USD ($) aircraft	Dec. 31, 2022 USD ($)
Fair Value Measurements
Marketable Securities	$ 694,171	$ 944,231
Maximum period for redemption	1 year	1 year
Marketable securities at cost	$ 694,400	$ 949,300
Held for sale \| CRJ 700
Fair Value Measurements
Number of aircraft held-for-sale \| aircraft	14
Assets held for sale	$ 56,700
Recurring \| Estimate of Fair Value Measurement
Fair Value Measurements
Marketable Securities	694,171	944,231
Investments in Other Companies	18,465	21,380
Cash and Cash Equivalents	125,330	102,984
Total Assets Measured at Fair Value	837,966	1,068,595
Recurring \| Estimate of Fair Value Measurement \| Bonds and bond funds
Fair Value Measurements
Marketable Securities	633,538	624,254
Recurring \| Estimate of Fair Value Measurement \| Commercial Paper
Fair Value Measurements
Marketable Securities	60,633	319,977
Recurring \| Level 1
Fair Value Measurements
Investments in Other Companies	4,380	7,200
Cash and Cash Equivalents	125,330	102,984
Total Assets Measured at Fair Value	129,710	110,184
Recurring \| Level 2
Fair Value Measurements
Marketable Securities	694,171	944,231
Total Assets Measured at Fair Value	694,171	944,231
Recurring \| Level 2 \| Bonds and bond funds
Fair Value Measurements
Marketable Securities	633,538	624,254
Recurring \| Level 2 \| Commercial Paper
Fair Value Measurements
Marketable Securities	60,633	319,977
Recurring \| Level 3
Fair Value Measurements
Investments in Other Companies	14,085	14,180
Total Assets Measured at Fair Value	$ 14,085	$ 14,180

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