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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 335,093 $ 273,706
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property and equipment 44,114 46,554
Stock-based compensation 35,745 34,351
Excess tax benefit associated with stock-based compensation (15,566) (19,420)
Unrealized Gain (Loss) on Derivatives (2,411) 9,058
Contingent interest payment for debenture (13,385) (10,759)
Amortization of Debt Issuance Costs and Discounts 9,971 9,122
Other, net (2,944) (961)
Changes in operating assets and liabilities    
Accounts receivable (3,536) (1,319)
Prepaid expenses and other assets 17,814 2,967
Accounts payable and accrued liabilities (8,285) 14,658
Deferred revenues 19,470 49,787
Deferred Income Taxes 56,397 55,203
Net cash provided by operating activities 472,477 462,947
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Proceeds from maturities and sales of marketable securities 3,029,699 1,965,767
Purchases of marketable securities (2,917,743) (2,443,865)
Purchases of property and equipment (19,889) (28,659)
Deposit to Acquire Intangible Assets 143,000 0
Other investing activities 171 (3,666)
Net cash used in investing activities (50,762) (510,423)
Cash flows from financing activities:    
Proceeds from issuance of common stock from option exercises and employee stock purchase plans 13,670 14,690
Repurchases of common stock (501,934) (492,575)
Proceeds from Issuance of Senior Long-term Debt 0 492,237
Excess tax benefit associated with stock-based compensation 15,566 19,420
Net cash used in financing activities (472,698) 33,772
Effect of exchange rate changes on cash and cash equivalents 109 (33)
Net decrease in cash and cash equivalents (50,874) (13,737)
Cash and cash equivalents at beginning of period 228,659 191,608
Cash and cash equivalents at end of period 177,785 177,871
Supplemental cash flow disclosures:    
Cash paid for interest, net of capitalized interest 84,930 68,678
Cash paid for income taxes, net of refunds received $ 14,474 $ 13,289