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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 239,512 $ 220,666
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property and equipment 25,172 29,417
Gain (Loss) on Disposition of Business (10,607) 0
Stock-based compensation 25,938 22,891
Contingent interest payment for debenture (7,719) (6,544)
Amortization of Debt Issuance Costs and Discounts 7,048 6,590
Other, net (4,326) (2,385)
Changes in operating assets and liabilities    
Other assets 8,310 12,632
Accounts payable and accrued liabilities (30,566) (28,653)
Deferred revenues 34,246 26,346
Deferred Income Taxes 41,889 36,039
Net cash provided by operating activities 328,897 316,999
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Proceeds from maturities and sales of marketable securities 2,356,948 2,056,607
Purchases of marketable securities (2,351,738) (2,101,863)
Purchases of property and equipment (18,974) (13,458)
Other investing activities 12,108 206
Net cash used in investing activities (1,656) (58,508)
Cash flows from financing activities:    
Proceeds from employee stock purchase plans 7,997 8,084
Repurchases of common stock (325,759) (324,235)
Net cash used in financing activities (317,762) (316,151)
Effect of exchange rate changes on cash and cash equivalents 1,002 (33)
Net decrease in cash and cash equivalents 10,481 (57,693)
Cash and cash equivalents at beginning of period 231,945 228,659
Cash and cash equivalents at end of period 242,426  
Supplemental cash flow disclosures:    
Cash paid for interest, net of capitalized interest 58,797 57,636
Cash paid for income taxes, net of refunds received $ 23,662 $ 13,994