Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 26,148	$ 18,985
Adjustments to reconcile net income to net cash provided by operating activities:
Advisory fees paid in gold and other precious metals	(11,033)
Contractual gold payments	2,715
Gain on revaluation of deferred consideration - gold payments	(9,898)
Stock-based compensation	6,838	6,951
Deferred income taxes	(1,055)	5,890
Paid-in-kind interest income (Note 8)	(840)
Settlement gain		(6,909)
Amortization of credit facility issuance costs	637
Depreciation and amortization	692	689
Other	834	301
Changes in operating assets and liabilities, net of the effects of the ETFS Acquisition:
Securities owned, at fair value	(2,028)	1,148
Accounts receivable	2,871	(1,671)
Income taxes receivable/payable	8,109	2,217
Prepaid expenses	(1,669)	(1,405)
Gold and other precious metals	8,930
Other assets	975	143
Acquisition payable		(3,542)
Fund management and administration payable	(380)	(729)
Compensation and benefits payable	(21,170)	(3,958)
Securities sold, but not yet purchased, at fair value	1,077	(1,222)
Payable to ETFS Capital Limited	222
Accounts payable and other liabilities	(2,961)	395
Net cash provided by operating activities	9,014	17,283
Cash flows from investing activities:
Purchase of fixed assets	(34)	(220)
Purchase of securities held-to-maturity		(759)
Purchase of debt securities available-for-sale		(38,680)
Purchase of investments		(5,000)
Funding of AdvisorEngine note receivable (Note 8)	(5,000)
Proceeds from held-to-maturity securities maturing or called prior to maturity	1,063	2,102
Proceeds from sales and maturities of debt securities available-for-sale	64,498	46,065
Cash paid - ETFS Acquisition, net of cash acquired (Note 3)	(233,172)
Net cash (used in)/provided by investing activities	(172,645)	3,508
Cash flows from financing activities:
Dividends paid	(9,167)	(21,872)
Shares repurchased	(1,006)	(3,693)
Credit facility issuance costs	(8,690)
Preferred stock issuance costs	(181)
Proceeds from the issuance of long-term debt (Note 12)	200,000
Proceeds from exercise of stock options	139	42
Net cash provided by/(used in) financing activities	181,095	(25,523)
(Decrease)/increase in cash flow due to changes in foreign exchange rate	(913)	624
Net increase/(decrease) in cash and cash equivalents	16,551	(4,108)
Cash and cash equivalents-beginning of period	54,193	92,722
Cash and cash equivalents-end of period	70,744	88,614
Supplemental disclosure of cash flow information:
Cash paid for taxes	2,841	$ 9,708
Cash paid for interest	$ 1,241