Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net cash flows from operating activities:
Net income	$ 1,070,394	$ 504,752
Adjustments to reconcile net income to net cash provided by operations:
Pre-tax income from discontinued operations, including gain on disposal	(1,050,582)	(310,007)
Deferred income tax provision	275,307	185,994
Depreciation and amortization of property, equipment and leasehold improvements	80,647	69,480
Other amortization	(26,796)	(21,107)
Share-based compensation	37,975	31,494
Provision for doubtful accounts	26,529	26,764
Net securities (gains) losses	1,019	(21,278)
(Income) loss related to associated companies	(115,007)	19,090
Distributions from associated companies	98,426	100,033
Net losses related to property and equipment, and other assets	10,833	11,414
Gain on sale of subsidiaries and associated companies	(221,712)	(178,236)
Net change in:
Securities deposited with clearing and depository organizations	64,890	119
Trading assets	(1,670,376)	(639,464)
Securities borrowed	309,722	0
Securities purchased under agreements to resell	(53,020)	524,937
Receivables from brokers, dealers and clearing organizations	(261,534)	(602,761)
Receivables from customers of securities operations	(398,154)	(458,066)
Other receivables	(70,514)	(137,408)
Other assets	(23,910)	(44,494)
Trading liabilities	1,122,273	327,587
Securities loaned	(275,629)	(68,310)
Securities sold under agreements to repurchase	1,250,575	1,668,725
Payables to brokers, dealers and clearing organizations	(287,288)	(652,668)
Payables to customers of securities operations	523,611	162,387
Trade payables, expense accruals and other liabilities	(291,973)	134,125
Other	(90,448)	73,525
Net cash provided by operating activities - continuing operations	35,258	706,627
Net cash provided by operating activities - discontinued operations	164,650	354,289
Net cash provided by operating activities	199,908	1,060,916
Net cash flows from investing activities:
Acquisitions of property, equipment and leasehold improvements, and other assets	(282,397)	(90,168)
Proceeds from disposals of property and equipment, and other assets	11,994	25,213
Proceeds from sale of subsidiaries, net of expenses and cash of operations sold	100,000	289,767
Proceeds from sale of associated companies	379,130	0
Advances on notes, loans and other receivables	(10,000)	(46,532)
Collections on notes, loans and other receivables	17,404	268,920
Loans to and investments in associated companies	(1,936,496)	(3,043,800)
Capital distributions and loan repayments from associated companies	1,970,648	2,765,006
Purchases of investments (other than short-term)	(3,242,732)	(770,687)
Proceeds from maturities of investments	1,000,146	196,493
Proceeds from sales of investments	1,012,423	412,158
Other	130	1,341
Net cash provided by (used for) investing activities - continuing operations	(979,750)	7,711
Net cash provided by (used for) investing activities - discontinued operations	861,209	(36,465)
Net cash used for investing activities	(118,541)	(28,754)
Net cash flows from financing activities:
Issuance of debt, net of issuance costs	2,198,326	1,349,399
Other changes in short-term borrowings, net	0	4,282
Repayment of debt	(2,024,680)	(652,889)
Net change in other secured financings	409,780	(134,743)
Net change in bank overdrafts	2,369	(5,764)
Issuance of common shares	3,486	1,288
Distributions to noncontrolling interests	0	(9,617)
Contributions from noncontrolling interests	113	25,724
Purchase of common shares for treasury	(635,835)	(75,930)
Dividends paid	(111,776)	(81,445)
Other	456	(185)
Net cash provided by (used for) financing activities - continuing operations	(157,761)	420,120
Net cash provided by (used for) financing activities - discontinued operations	120,322	(202,137)
Net cash provided by (used for) financing activities	(37,439)	217,983
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(16,469)	5,550
Change in cash classified as assets held for sale	0	(3,136)
Net increase in cash, cash equivalents and restricted cash	27,459	1,252,559
Cash, cash equivalents and restricted cash at January 1,	5,774,505	4,597,113
Cash, cash equivalents and restricted cash at September 30,	$ 5,801,964	$ 5,849,672