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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 $ 582,489 $ 457,248 $ 440,645
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment 48,367 49,878 58,167
Stock-based compensation 52,504 52,907 50,044
Gain on Disposition of Business (54,840) (10,421) 0
Loss on Extinguishment of Debt 6,554 0 0
contingent interest payment for debenture 0 (15,232) (13,385)
Amortization of Financing Costs and Discounts 7,137 14,678 13,411
Investment Income, Amortization of Discount (18,259) (14,860) (5,527)
Other Operating Activities, Cash Flow Statement 955 826 (662)
Changes in operating assets and liabilities      
Prepaid expenses and other assets (1,041) (13,775) (8,109)
Accounts payable and accrued liabilities (2,130) 15,483 40,244
Deferred revenues 19,825 25,348 14,347
Net deferred income taxes and other long term tax liabilities 54,124 113,131 87,614
Net Cash Provided by (Used in) Operating Activities 697,767 702,761 693,007
Cash flows from investing activities:      
Proceeds from maturities and sales of marketable securities 4,031,809 4,562,161 3,817,899
Purchases of marketable securities (2,976,752) (4,929,834) (3,691,057)
Proceeds from Divestiture of Businesses 52,240 11,748 0
Purchases of property and equipment (37,007) (49,499) (26,574)
Payments to Acquire Intangible Assets 0 0 (143,000)
Other investing activities (160) 0 0
Net cash provided by (used in) investing activities 1,070,130 (405,424) (42,732)
Cash flows from financing activities:      
Repayments of Subordinated Debt (1,250,009) 0 0
Proceeds from issuance of common stock from option exercises and employee stock purchase plans 12,836 12,915 13,670
Repurchases of common stock (638,152) (621,173) (662,491)
Proceeds received from borrowing 0 543,185 0
Net cash used in financing activities (1,875,325) (65,073) (648,821)
Effect of exchange rate changes on cash and cash equivalents (958) 1,294 (501)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (108,386) 233,558 953
Cash and cash equivalents at end of period 357,415 465,851  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 366,753 475,139 241,581
Supplemental cash flow disclosures:      
Cash paid for interest, net of capitalized interest 117,956 117,234 115,544
Cash paid for income taxes, net of refunds received $ 84,906 $ 28,294 $ 14,303