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Consolidated Statements Of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 457,248,000 $ 440,645,000 $ 375,236,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment and amortization of other intangible assets 49,878,000 58,167,000 61,491,000
Stock-based compensation 52,907,000 50,044,000 46,075,000
Gain (Loss) on Disposition of Business (10,421,000) 0 0
Unrealized Gain (Loss) on Derivatives 893,000 (2,402,000) 14,130,000
contingent interest payment for debenture (15,232,000) (13,385,000) (10,759,000)
Amortization of Financing Costs and Discounts 14,678,000 13,411,000 12,292,000
Investment Income, Amortization of Discount (14,860,000) (5,527,000) (1,843,000)
Other Operating Activities, Cash Flow Statement (67,000) 1,740,000 62,000
Changes in operating assets and liabilities      
Prepaid expenses and other assets (13,775,000) (8,109,000) 1,067,000
Accounts payable and accrued liabilities 15,483,000 40,244,000 21,013,000
Deferred revenues 25,348,000 14,347,000 70,988,000
Net deferred income taxes and other long term tax liabilities 113,131,000 87,614,000 82,328,000
Net Cash Provided by (Used in) Operating Activities 702,761,000 693,007,000 669,946,000
Cash flows from investing activities:      
Proceeds from maturities and sales of marketable securities 4,562,161,000 3,817,899,000 2,767,027,000
Purchases of marketable securities (4,929,834,000) (3,691,057,000) (3,219,329,000)
Purchases of property and equipment (49,499,000) (26,574,000) (40,656,000)
Payments to Acquire Intangible Assets 0 (143,000,000) 0
Other investing activities 12,096,000 2,333,000 (3,941,000)
Net cash provided by (used in) investing activities (405,076,000) (40,399,000) (496,899,000)
Cash flows from financing activities:      
Proceeds from issuance of common stock from option exercises and employee stock purchase plans 12,915,000 13,670,000 14,690,000
Repurchases of common stock (621,173,000) (662,491,000) (643,169,000)
Proceeds received from borrowing 543,185,000 0 492,237,000
Net cash used in financing activities (65,073,000) (648,821,000) (136,242,000)
Effect of exchange rate changes on cash and cash equivalents 1,294,000 (501,000) 246,000
Net increase (decrease) in cash and cash equivalents 233,906,000 3,286,000 37,051,000
Cash and cash equivalents at beginning of period 231,945,000 228,659,000 191,608,000
Cash and cash equivalents at end of period 465,851,000 231,945,000 228,659,000
Supplemental cash flow disclosures:      
Cash paid for interest, net of capitalized interest 117,234 115,544 99,473
Cash paid for income taxes, net of refunds received $ 28,294,000 $ 14,303,000 $ 39,723,000