Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (11,761)	$ 6,055
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	4,189	4,091
Amortization of intangible assets	11,309	368
Net losses from investments	44	45
Deferred income taxes	(10,814)	(831)
Stock-based compensation	5,533	4,071
Operating lease right-of-use asset amortization and impairments	6,415
Amortization of deferred financing fees	474
Amortization of premium on investments		18
Foreign currency losses	498	437
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	22,476	20,020
Deferred commissions	840	2,086
Prepaid expenses and other current assets	(1,451)	280
Accounts payable	3,170	423
Accrued expenses and other liabilities	(9,976)	(15,310)
Deferred revenue	18,799	6,533
Operating lease liabilities	(6,216)
Net cash provided by operating activities	33,529	28,286
Cash flows from investing activities:
Acquisitions, net of cash acquired	(238,943)	(1,289)
Purchases of property and equipment	(4,666)	(2,544)
Purchases of marketable investments		(14,673)
Proceeds from sales and maturities of marketable investments		18,828
Other investing activity	30
Net cash provided by (used in) investing activities	(243,579)	322
Cash flows from financing activities:
Proceeds from borrowings, net of costs	171,275
Payments on borrowings	(33,125)
Payment of debt issuance costs	(857)
Deferred acquisition payments	(766)
Dividends paid on common stock		(7,196)
Repurchases of common stock		(9,642)
Proceeds from issuance of common stock under employee equity incentive plans	4,280	3,678
Taxes paid related to net share settlements of stock-based compensation awards	(130)	(102)
Net cash provided by (used in) financing activities	140,677	(13,262)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	189	(2,139)
Net change in cash, cash equivalents and restricted cash	(69,184)	13,207
Cash and cash equivalents, beginning of period	140,296	79,790
Cash, cash equivalents and restricted cash, end of period	71,112	92,997
Supplemental disclosure of cash flow information:
Cash paid for interest	3,791
Cash paid for income taxes	$ 2,540	$ 2,102