Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities:
Net Income	$ 355,880	$ 493,317	$ 360,286
Adjustments to reconcile Net Income (Loss) to net cash provided by operating activities:
Depreciation and amortization	354,139	357,330	328,101
Accretion of debt securities discount	0	0	(2)
Provision for (reversal of) expected credit losses	(595)	(378)	463
Loss on early extinguishment of debt	689	6,042	81
Special charge	16,215	0	16,265
Unrealized loss on financial instruments	0	113	71,053
Loss (gain) on disposal of flight equipment	3,098	(794)	(7,248)
Deferred taxes	104,747	152,399	133,598
Stock-based compensation	13,838	14,014	21,997
Changes in:
Accounts receivable	49,885	(37,800)	26,132
Prepaid expenses, current assets and other assets	(18,200)	(49,763)	(56,716)
Accounts payable, accrued liabilities and other liabilities	(41,957)	(11,496)	115,532
Net cash provided by operating activities	837,739	922,984	1,009,542
Investing Activities:
Capital expenditures	(103,198)	(90,288)	(78,933)
Purchase deposits and payments for flight equipment and modifications	(743,079)	(407,684)	(184,273)
Investment in joint ventures	(10,614)	(4,893)	(9,298)
Proceeds from investments	0	0	881
Proceeds from disposal of flight equipment	36,626	9,470	126,335
Net cash used for investing activities	(820,265)	(493,395)	(145,288)
Financing Activities:
Proceeds from debt issuance	652,929	212,717	417,733
Payment of debt issuance costs	(14,701)	(9,541)	(6,100)
Payments of debt and finance lease obligations	(693,723)	(542,594)	(429,749)
Proceeds from revolving credit facility	0	0	75,000
Payment of revolving credit facility	0	0	(175,000)
Purchase of treasury stock	(100,000)	0	0
Customer maintenance reserves and deposits received	16,742	17,745	15,168
Customer maintenance reserves paid	(12,178)	(35,608)	(14,437)
Treasury shares withheld for payment of taxes	(13,649)	(7,572)	(4,018)
Net cash used for financing activities	(164,580)	(364,853)	(121,403)
Net decrease in cash, cash equivalents and restricted cash	(147,106)	64,736	742,851
Cash, cash equivalents and restricted cash at the beginning of period	921,017	856,281	113,430
Cash, cash equivalents and restricted cash at the end of period	773,911	921,017	856,281
Noncash Investing and Financing Activities:
Acquisition of property and equipment included in Accounts payable and accrued liabilities	6,515	38,985	36,619
Acquisition of property and equipment acquired under operating leases	5,343	16,117	91,538
Acquisition of flight equipment under finance leases	24,808	191,994	18,476
Issuance of shares related to settlement of warrant liability	0	31,583	49,545
Issuance of shares related to settlement of convertible notes	7,902	0	0
Customer maintenance reserves settled with sale of aircraft	$ 0	$ 0	$ 6,497