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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 6,055 $ 9,094
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 4,091 3,168
Amortization of intangible assets 368 385
Net losses from investments 45 225
Deferred income taxes (831) (691)
Stock-based compensation 4,071 4,245
Amortization of premium on investments 18 128
Foreign currency losses 437 360
Changes in assets and liabilities    
Accounts receivable 20,020 8,457
Deferred commissions 2,086 1,475
Prepaid expenses and other current assets 280 1,470
Accounts payable 423 (730)
Accrued expenses and other liabilities (15,310) (10,304)
Deferred revenue 6,533 9,611
Net cash provided by operating activities 28,286 26,893
Cash flows from investing activities:    
Acquisitions (1,289)  
Purchases of property and equipment (2,544) (3,240)
Purchases of marketable investments (14,673) (25,685)
Proceeds from sales and maturities of marketable investments 18,828 28,612
Other investing activity   224
Net cash provided by (used in) investing activities 322 (89)
Cash flows from financing activities:    
Dividends paid on common stock (7,196) (6,815)
Repurchases of common stock (9,642) (36,426)
Proceeds from issuance of common stock under employee equity incentive plans 3,678 4,872
Taxes paid related to net share settlements of stock-based compensation awards (102) (537)
Net cash used in financing activities (13,262) (38,906)
Effect of exchange rate changes on cash and cash equivalents (2,139) 2,250
Net increase (decrease) in cash and cash equivalents 13,207 (9,852)
Cash and cash equivalents, beginning of period 79,790 76,958
Cash and cash equivalents, end of period 92,997 67,106
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 2,102 $ 4,705