CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net income	$ 110,651	$ 84,937
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of flight equipment	136,134	123,909
Stock-based compensation	3,432	3,773
Deferred taxes	30,668	48,941
Amortization of debt discounts and issuance costs	8,022	8,992
Amortization of prepaid lease costs	7,020	4,037
Gain on aircraft sales, trading and other activity	(765)	(7,264)
Changes in operating assets and liabilities:
Other assets	(25,605)	(20,359)
Accrued interest and other payables	(24,913)	(30,549)
Rentals received in advance	2,023	3,247
Net cash provided by operating activities	246,667	219,664
Investing Activities
Acquisition of flight equipment under operating lease	(362,519)	(597,254)
Payments for deposits on flight equipment purchases	(63,751)	(200,549)
Proceeds from aircraft sales, trading and other activity		96,840
Acquisition of aircraft furnishings, equipment and other assets	(54,970)	(51,464)
Net cash used in investing activities	(481,240)	(752,427)
Financing Activities
Issuance of common stock upon exercise of options and warrants	2,628	864
Cash dividends paid	(10,359)	(7,714)
Tax withholdings on stock-based compensation	(7,141)	(5,252)
Net change in unsecured revolving facility	(510,000)	(60,000)
Proceeds from debt financings	1,230,765	487,955
Payments in reduction of debt financings	(537,444)	(46,598)
Debt issuance costs	(2,623)	(1,531)
Security deposits and maintenance reserve receipts	48,754	56,165
Security deposits and maintenance reserve disbursements	(16,665)	(7,840)
Net cash provided by financing activities	197,915	416,049
Net decrease in cash	(36,658)	(116,714)
Cash, cash equivalents and restricted cash at beginning of period	308,282	290,802
Cash, cash equivalents and restricted cash at end of period	271,624	174,088
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, including capitalized interest of $12,816 and $11,402 at March 31, 2018 and 2017, respectively	95,466	90,059
Supplemental Disclosure of Noncash Activities
Buyer furnished equipment, capitalized interest, deposits on flight equipment purchases and seller financing applied to acquisition of flight equipment and other assets applied to payments for deposits on flight equipment purchases	79,677	220,610
Cash dividends declared, not yet paid	$ 10,397	$ 7,736