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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 147,462 $ 169,571 $ 113,701
Adjustments to reconcile net income to cash provided by operations:      
Depreciation and amortization 61,759 53,395 49,773
Share-based compensation expense 52,740 37,348 29,747
Provision for losses - accounts receivable 2,286 4,110 4,484
Deferred income tax benefit (5,069) (33,664) (26,432)
Changes in operating assets and liabilities, exclusive of effects of acquired companies:      
Accounts receivable (53,771) (35,170) (34,760)
Income tax receivable 6,642 (8,444) 18,185
Prepaid expenses and other current assets (588) (6,958) 246
Accounts payable (2,416) 878 387
Accrued liabilities (2,445) 6,050 10,717
Deferred revenue 43,603 8,639 25,811
Net cash provided by operating activities 250,203 195,755 191,859
Cash flows from investing activities:      
Cost of acquisitions, net of cash acquired (178,093) (11,344) (9,394)
Purchase of marketable security investments (115,625) (59,779) (20,316)
Proceeds from marketable security investments 81,205 28,786 16,837
Additions to property and equipment (27,424) (43,057) (37,726)
Decrease (increase) in other 1,682 (1) (121)
Net cash used by investing activities (238,255) (85,395) (50,720)
Cash flows from financing activities:      
Decrease in net borrowings on revolving line of credit 0 (10,000) (56,000)
Purchase of treasury shares (146,553) (7,474) (111,838)
Contributions from employee stock purchase plan 8,051 7,044 6,236
Proceeds from exercise of stock options 74,907 49,845 23,527
Net cash (used) provided by financing activities (63,595) 39,415 (138,075)
Net (decrease) increase in cash and cash equivalents (51,647) 149,775 3,064
Cash and cash equivalents at beginning of period 185,926 36,151 33,087
Cash and cash equivalents at end of period $ 134,279 $ 185,926 $ 36,151