CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 225,862	$ 185,862
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of flight equipment	278,734	250,399
Stock-based compensation	8,317	9,077
Deferred taxes	62,866	103,885
Amortization of debt discounts and issuance costs	16,032	15,429
Amortization of prepaid lease costs	14,610	11,473
Gain on aircraft sales, trading and other activity	(2,185)	(25,048)
Changes in operating assets and liabilities:
Other assets	(47,313)	(90,297)
Accrued interest and other payables	23,737	31,240
Rentals received in advance	7,331	5,943
Net cash provided by operating activities	587,991	497,963
Investing Activities
Acquisition of flight equipment under operating lease	(1,402,374)	(1,142,367)
Payments for deposits on flight equipment purchases	(360,440)	(385,628)
Proceeds from aircraft sales, trading and other activity	250	433,284
Acquisition of aircraft furnishings, equipment and other assets	(141,125)	(84,874)
Net cash used in investing activities	(1,903,689)	(1,179,585)
Financing Activities
Issuance of common stock upon exercise of options and warrants	4,128	1,664
Cash dividends paid	(20,757)	(15,450)
Tax withholdings on stock-based compensation	(7,141)	(5,600)
Net change in unsecured revolving facility	109,000	711,000
Proceeds from debt financings	1,738,665	1,096,673
Payments in reduction of debt financings	(594,706)	(1,229,690)
Debt issuance costs	(5,301)	(3,964)
Security deposits and maintenance reserve receipts	109,007	110,766
Security deposits and maintenance reserve disbursements	(44,421)	(12,630)
Net cash provided by financing activities	1,288,474	652,769
Net decrease in cash	(27,224)	(28,853)
Cash, cash equivalents and restricted cash at beginning of period	308,282	290,802
Cash, cash equivalents and restricted cash at end of period	281,058	261,949
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, including capitalized interest of $25,692 and $21,931 at June 30, 2018 and 2017, respectively	149,077	159,269
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	451,048	312,837
Cash dividends declared, not yet paid	$ 10,399	$ 7,741