Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net income	$ 48,148	$ 51,569	$ 29,376
Adjustments to reconcile net income to net cash from operating activities:
Stock-based compensation	16,300	13,253	11,653
Depreciation and amortization of acquired intangible assets	44,208	38,589	38,139
Impairment of intangible asset	50,900	0	0
Reduction of right-of-use assets	4,425	0	0
Restructuring (non-cash)	0	0	1,569
Deferred income taxes	(67,549)	(3,039)	(16,159)
Amortization of premium on investments, net, and debt issuance costs	1,042	833	1,099
Accretion of debt discounts	228	163	1,947
Loss on debt extinguishment and modification expense	0	1,534	20,445
Gain on sale of a business	(3,256)	0	0
Other	734	73	30
Cash provided (used) by changes in operating assets and liabilities:
Accounts receivable	871	(4,286)	(483)
Commissions receivable	(471)	1,260	(678)
Other receivables	4,506	(3,851)	(204)
Prepaid expenses and other current assets	10,537	(815)	(869)
Other long-term assets	3,377	3,450	(12,281)
Accounts payable	29	(615)	(123)
Commissions and advisory fees payable	432	(2,614)	1,226
Lease liabilities	(7,335)	0	0
Deferred revenue	(17,367)	9,930	(3,248)
Accrued expenses and other current and long-term liabilities	3,045	114	1,407
Net cash provided by operating activities	92,804	105,548	72,846
Investing activities:
Business acquisition, net of cash acquired	(166,560)	0	0
Purchases of property and equipment	(10,501)	(7,633)	(5,039)
Proceeds from sale of a business, net of cash	7,467	0	0
Proceeds from sales of investments	0	0	249
Proceeds from maturities of investments	0	0	7,252
Purchases of investments	0	0	(409)
Net cash provided (used) by investing activities	(169,594)	(7,633)	2,053
Financing activities:
Proceeds from credit facilities, net of debt issuance costs and debt discount	131,489	0	365,836
Repurchase of convertible notes	0	0	(172,827)
Payments on credit facilities	(313)	(80,000)	(290,000)
Repayment of note payable with related party	0	0	(3,200)
Stock repurchases	(28,399)	0	0
Payment of redeemable noncontrolling interests	(24,945)	0	0
Proceeds from stock option exercises	4,387	12,773	40,271
Proceeds from issuance of stock through employee stock purchase plan	2,212	2,100	1,429
Tax payments from shares withheld for equity awards	(5,652)	(8,362)	(9,095)
Contingent consideration payments for business acquisition	(943)	(1,315)	(946)
Other	0	0	(30)
Net cash provided (used) by financing activities	77,836	(74,804)	(68,562)
Net cash provided by continuing operations	1,046	23,111	6,337
Net cash provided by investing activities from discontinued operations	0	0	1,028
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	38	(56)	78
Net increase in cash, cash equivalents, and restricted cash	1,084	23,055	7,443
Cash, cash equivalents, and restricted cash, beginning of period	85,366	62,311	54,868
Cash, cash equivalents, and restricted cash, end of period	86,450	85,366	62,311
Supplemental cash flow information:
Cash paid for income taxes	3,106	1,806	1,267
Cash paid for interest	$ 18,852	$ 15,335	$ 23,316