Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 220,666	$ 181,249
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	29,417	31,620
Stock-based compensation	22,891	22,129
Excess tax benefit associated with stock-based compensation	(12,708)	(11,366)
Unrealized Gain (Loss) on Derivatives	(971)	4,311
Contingent interest payment for debenture	(6,544)	(5,225)
Amortization of Debt Issuance Costs and Discounts	6,590	5,941
Other, net	(1,414)	(1,099)
Changes in operating assets and liabilities
Accounts receivable	(2,798)	(1,018)
Prepaid expenses and other assets	15,430	7,369
Accounts payable and accrued liabilities	(28,653)	(4,778)
Deferred revenues	26,346	41,247
Deferred Income Taxes	36,039	37,245
Net cash provided by operating activities	304,291	307,625
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of marketable securities	2,056,607	1,283,367
Purchases of marketable securities	(2,101,863)	(1,747,025)
Purchases of property and equipment	(13,458)	(21,891)
Other investing activities	206	(3,736)
Net cash used in investing activities	(58,508)	(489,285)
Cash flows from financing activities:
Proceeds from issuance of common stock from option exercises and employee stock purchase plans	8,084	9,014
Repurchases of common stock	(324,235)	(335,885)
Proceeds from Issuance of Senior Long-term Debt	0	492,237
Excess tax benefit associated with stock-based compensation	12,708	11,366
Net cash used in financing activities	(303,443)	176,732
Effect of exchange rate changes on cash and cash equivalents	(33)	606
Net decrease in cash and cash equivalents	(57,693)	(4,322)
Cash and cash equivalents at beginning of period	228,659	191,608
Cash and cash equivalents at end of period	170,966	187,286
Supplemental cash flow disclosures:
Cash paid for interest, net of capitalized interest	57,636	42,839
Cash paid for income taxes, net of refunds received	$ 13,994	$ 14,342

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