Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income	$ 101,886	$ 28,910
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for deferred income taxes	11,907	3,075
Depreciation and amortization	8,216	10,485
Deferred financing costs and derivative and accretion expense	2,306	1,216
Stock-based and deferred compensation	9,446	8,743
Change in fair value of contingent consideration obligations	(200)	(14)
Unrealized depreciation (appreciation) on investments	2,269	(1,886)
Loss on equity method investment		154
Loss on debt extinguishment	917
Changes in operating assets and liabilities:
Receivables	19,244	(66)
Prepaid expenses	(1,400)	(1,087)
Other assets	14	4
Accounts payable and accrued expenses	(12,615)	8,534
Accrued compensation and benefits	(20,881)	(8,671)
Other liabilities	(198)	(119)
Net cash provided by operating activities	120,911	49,278
Cash flows from investing activities
Purchases of property and equipment	(5,280)	(892)
Purchases of trading securities	(3,641)	(3,054)
Sales of trading securities	1,990	1,435
Purchases of available-for-sale securities	(274)	(104)
Sales of available-for-sale securities	274	104
Net cash used in investing activities	(6,931)	(2,511)
Cash flows from financing activities
Repurchase of common stock	(13,057)	(3,526)
Payments of taxes related to net share settlement of equity awards	(7,880)	(236)
Repayment of long-term senior debt	(70,287)
Repayment of promissory note		(96)
Payment of dividends	(7,008)	(65)
Receipt of consideration for acquisition	649
Net cash used in financing activities	(95,831)	(2,938)
Effect of changes of foreign exchange rate on cash and cash equivalents	(86)	7
Net increase in cash and cash equivalents	18,063	43,836
Cash and cash equivalents, beginning of period	37,121	51,491
Cash and cash equivalents, end of period	55,184	95,327
Supplemental cash flow information
Cash paid for interest	23,296	7,499
Cash paid for income taxes	3,269	6,876
Class A
Cash flows from financing activities
Issuance of common stock, net of costs	58	29
Class B
Cash flows from financing activities
Issuance of common stock, net of costs	$ 1,694	$ 956