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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 76,986 $ 64,539
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 29,649 26,102
Share-based compensation expense 23,490 17,577
Deferred income tax benefit (5,196) (8,847)
Changes in operating assets and liabilities, exclusive of effects of acquired companies:    
Accounts receivable (48,870) (32,334)
Income taxes (1,762) (9,311)
Prepaid expenses and other current assets (815) (4,797)
Accounts payable (4,599) 2,152
Accrued liabilities (12,185) (11,061)
Deferred revenue 10,532 5,555
Net cash provided by operating activities 67,230 49,575
Cash flows from investing activities:    
Additions to property and equipment (14,952) (30,123)
Purchase of marketable security investments (74,850) (21,392)
Proceeds from marketable security investments 39,154 17,029
Cost of acquisitions. net of cash acquired (157,152) (5,855)
Increase in other (186) (68)
Net cash used by investing activities (207,986) (40,409)
Cash flows from financing activities:    
Decrease in net borrowings on revolving line of credit 0 (10,000)
Purchase of treasury shares 0 (7,032)
Proceeds from exercise of stock options 44,317 23,360
Contributions from employee stock purchase plan 3,760 3,427
Net cash provided by financing activities 48,077 9,755
Net (decrease) increase in cash and cash equivalents (92,679) 18,921
Cash and cash equivalents at beginning of period 185,926 36,151
Cash and cash equivalents at end of period $ 93,247 $ 55,072