Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 9,990	$ (9,570)	$ 15,380
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	9,879	8,572	7,955
Impairment of property and equipment	1,098
Amortization of intangible assets	19,683	22,619	1,162
Net gains from investments	(2,472)	(45)	(426)
Deferred income taxes	(1,677)	(3,957)	2,931
Stock-based compensation	10,877	11,684	8,300
Operating lease right-of-use assets, amortization, and impairments	13,397	12,592
Amortization of deferred financing fees	981	968
Amortization of discount on investments			(68)
Foreign currency losses	582	933	603
Changes in assets and liabilities, net of businesses acquired
Accounts receivable	234	3,696	2,588
Deferred commissions	(3,299)	(4,643)	(1,077)
Prepaid expenses and other current assets	(423)	(3,697)	285
Accounts payable	109	278	172
Accrued expenses and other liabilities	297	4,421	1,217
Deferred revenue	(925)	15,508	(604)
Operating lease liabilities	(10,577)	(10,953)
Net cash provided by operating activities	47,754	48,406	38,418
Cash flows from investing activities:
Acquisitions, net of cash acquired		(237,684)	(9,250)
Purchases of property and equipment	(8,905)	(11,890)	(5,049)
Purchases of marketable investments			(41,810)
Proceeds from maturities of marketable investments			63,627
Proceeds from sales of marketable investments			32,568
Other investing activity	4,335	29
Net cash provided by (used in) investing activities	(4,570)	(249,545)	40,086
Cash flows from financing activities:
Proceeds from borrowings, net of costs		171,275
Payments on borrowings	(23,375)	(42,250)
Payment of debt issuance costs		(857)
Deferred acquisition payments	(3,112)	(2,799)
Dividends paid on common stock			(14,502)
Repurchases of common stock			(9,946)
Proceeds from issuance of common stock under employee equity incentive plans	5,706	6,327	13,020
Taxes paid for net share settlements of stock-based compensation awards	(2,906)	(2,258)	(2,526)
Net cash provided by (used in) financing activities	(23,687)	129,438	(13,954)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,963	597	(4,044)
Net increase (decrease) in cash, cash equivalents and restricted cash	21,460	(71,104)	60,506
Cash, cash equivalents and restricted cash, beginning of year	69,192	140,296	79,790
Cash, cash equivalents and restricted cash, end of year	90,652	69,192	140,296
Supplemental disclosure of cash flow information:
Cash paid for interest	4,373	7,003
Cash paid for income taxes	$ 3,194	$ 4,433	$ 4,174