Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net income	$ 188,059	$ 119,990
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	22,712	22,388
Stock-based compensation expense	12,457	12,829
Depreciation and amortization of property, equipment and leasehold improvements	11,749	9,371
Amortization of debt origination fees	888	1,474
Deferred taxes	3,475	3,356
Amortization of discount on long-term debt	240	474
Excess tax benefits from stock-based compensation	(2,773)	(1,402)
Gain on disposition of subsidiary, net of costs	(84,615)
Other non-cash adjustments	548	(857)
Changes in assets and liabilities, net of assets and liabilities acquired:
Accounts receivable	(59,081)	(7,936)
Prepaid income taxes	(19,578)	(11,555)
Prepaid and other assets	(6,181)	1,198
Accounts payable	1,229	(2,343)
Deferred revenue	54,484	41,319
Accrued compensation and related benefits	(42,237)	(42,399)
Other accrued liabilities	11,790	(3,779)
Other	(2,073)	6,986
Net cash provided by operating activities	94,052	156,676
Cash flows from investing activities
Proceeds from redemption of short-term investments	0	70,900
Acquisitions, net of cash acquired	0	(23,268)
Dispositions, net of cash provided	362,811
Proceeds from the sale of capital equipment	8
Capitalized software development costs	(3,478)	(806)
Capital expenditures	(18,486)	(7,685)
Net cash provided by investing activities	340,855	39,141
Cash flows from financing activities
Repayment of long-term debt	(10,125)	(37,000)
Repurchase of treasury shares	(108,903)	(9,639)
Proceeds from exercise of stock options	5,406	6,880
Excess tax benefits from stock-based compensation	2,773	1,402
Net cash used in financing activities	(110,849)	(38,357)
Effect of exchange rate changes	747	(6,068)
Net increase (decrease) in cash and cash equivalents	324,805	151,392
Cash and cash equivalents, beginning of period	358,434	183,309
Cash and cash equivalents, end of period	683,239	334,701
Supplemental disclosure of cash flow information:
Cash paid for interest	9,346	10,297
Cash paid for income taxes	71,896	62,145
Supplemental disclosure of non-cash investing activities:
Property, equipment and leasehold improvements in other accrued liabilities	$ 14,576	$ 4,568