Income Taxes (Schedule Of The Tax Effect Of Temporary Differences And Carryforwards That Comprise Significant Portions Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Deferred compensation	$ 116,770	$ 128,515
Accrued expenses	32,555	26,359
Net operating loss carryforwards	29,061	28,432
Depreciation	5,472
Receivable reserves	3,956	2,488
Investment and jobs creation credit	2,057	2,081
Unrealized loss on investments		11,396
Other	164	513
Total deferred tax assets	190,035	199,784
Valuation allowance	(5,608)	(2,231)
Deferred Tax Assets, Net, Total	184,427	197,553
Change in accounting method	(32,806)
Goodwill and other intangibles	(15,605)	(14,249)
Unrealized gain on investments	(7,175)
Prepaid expenses	(4,265)	(2,382)
Depreciation		(3,119)
Deferred tax liabilities: Total	(59,851)	(19,750)
Net deferred tax assets	$ 124,576	$ 177,803