Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Net cash flows from operating activities:
Net income (loss)	$ 367,985	$ (147,990)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operations:
Deferred income tax provision (benefit)	131,957	(17,192)
Depreciation and amortization of property, equipment and leasehold improvements	69,825	70,770
Other amortization	7,986	7,562
Share-based compensation	20,375	16,055
Provision for doubtful accounts	21,024	16,598
Net securities gains	(1,571)	(8,142)
(Income) loss related to associated companies	59,975	(40,690)
Distributions from associated companies	34,463	71,858
Net (gains) losses related to property and equipment, and other assets	(833)	11,566
Gain on sale of subsidiary	(178,236)	0
Net change in:
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	(61,097)	(85,446)
Trading assets	(294,338)	1,639,682
Investments in managed funds	13,755	77,405
Securities borrowed	(143,554)	(604,046)
Securities purchased under agreements to resell	(452,154)	607,560
Receivables from brokers, dealers and clearing organizations	(969,962)	(310,748)
Receivables from customers of securities operations	(379,669)	86,026
Other receivables	(204,375)	(156,998)
Other assets	(193,880)	(383,319)
Trading liabilities	687,415	1,214,045
Securities loaned	616,701	(28,625)
Securities sold under agreements to repurchase	1,818,042	(1,548,353)
Payables to brokers, dealers and clearing organizations	(969,230)	(239,760)
Payables to customers of securities operations	300,774	(367,505)
Trade payables, expense accruals and other liabilities	85,517	76,697
Other	22,156	16,853
Net cash provided by (used for) operating activities	409,051	(26,137)
Net cash flows from investing activities:
Acquisitions of property, equipment and leasehold improvements, and other assets	(87,552)	(159,866)
Proceeds from disposals of property and equipment, and other assets	22,792	24,644
Proceeds from sale of subsidiary, net of expenses and cash of operations sold	289,767	0
Acquisitions, net of cash acquired	0	(9,673)
Advances on notes, loans and other receivables	(34,377)	(190,019)
Collections on notes, loans and other receivables	169,570	20,274
Loans to and investments in associated companies	(2,756,274)	(329,840)
Capital distributions and loan repayments from associated companies	2,595,676	321,953
Purchases of investments (other than short-term)	(522,310)	(387,651)
Proceeds from maturities of investments	112,455	59,493
Proceeds from sales of investments	409,881	174,405
Other	1,250	(3,247)
Net cash provided by (used for) investing activities	200,878	(479,527)
Net cash flows from financing activities:
Issuance of debt, net of issuance costs	1,096,817	413,645
Net change in short-term borrowings	(85,158)	86,547
Repayment of debt	(424,455)	(635,176)
Net change in other secured financings	(264,016)	64,493
Net change in bank overdrafts	(1,544)	(54,508)
Issuance of common shares	1,084	734
Net distributions to redeemable noncontrolling interests	(17,247)	(6,859)
Distributions to noncontrolling interests	(9,347)	(834)
Contributions from noncontrolling interests	24,669	115,801
Purchase of common shares for treasury	(32,126)	(34,357)
Dividends paid	(45,409)	(45,899)
Other	0	278
Net cash provided by (used for) financing activities	243,268	(96,135)
Effect of foreign exchange rate changes on cash	4,318	(5,913)
Change in cash classified as assets held for sale	(3,136)	0
Net increase (decrease) in cash and cash equivalents	854,379	(607,712)
Cash and cash equivalents at January 1,	3,807,558	3,638,648
Cash and cash equivalents at June 30,	$ 4,661,937	$ 3,030,936