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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 107,456 $ 88,238
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property and equipment 14,867 15,747
Stock-based compensation 11,759 10,128
Excess tax benefit associated with stock-based compensation (6,018) (5,993)
Unrealized Gain (Loss) on Derivatives (1,065) 7,019
Contingent interest payment for debenture (6,544) (5,225)
Amortization of Debt Issuance Costs and Discounts 3,267 2,845
Other, net (779) (144)
Changes in operating assets and liabilities    
Accounts receivable (3,779) (1,282)
Prepaid expenses and other assets 6,524 (3,084)
Accounts payable and accrued liabilities (31,537) (28,816)
Deferred revenues 30,998 34,582
Deferred Income Taxes 18,477 18,654
Net cash provided by operating activities 143,626 132,669
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Proceeds from maturities and sales of marketable securities 900,810 325,399
Purchases of marketable securities (874,031) (257,415)
Purchases of property and equipment (7,082) (13,042)
Other investing activities 0 (3,787)
Net cash used in investing activities 19,697 51,155
Cash flows from financing activities:    
Proceeds from issuance of common stock from option exercises and employee stock purchase plans 8,084 8,776
Repurchases of common stock (172,360) (178,330)
Proceeds from Issuance of Senior Long-term Debt 0 493,824
Excess tax benefit associated with stock-based compensation 6,018 5,993
Net cash used in financing activities (158,258) 330,263
Effect of exchange rate changes on cash and cash equivalents 301 184
Net decrease in cash and cash equivalents 5,366 514,271
Cash and cash equivalents at beginning of period 228,659  
Cash and cash equivalents at end of period 234,025 705,879
Supplemental cash flow disclosures:    
Cash paid for interest, net of capitalized interest 27,028 25,494
Cash paid for income taxes, net of refunds received $ 13,711 $ 12,970