Income Taxes (Schedule Of Reconciliation Between Statutory Federal Income Tax Rate And Company's Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Income Taxes [Abstract]
U.S. Statutory Tax Rate	35.00%		35.00%		35.00%
Increase (Decrease) Due to State and Local Taxes	13.10%		7.10%		22.80%
Rate Benefits as a Limited Liability Company/Flow Through	(5.70%)		(10.20%)		(15.60%)
Foreign Taxes	4.30%		0.10%		(16.60%)
Non-Deductible Expenses	17.10%	[1]	12.20%	[1]	28.70%	[1]
Valuation Allowances	(0.90%)		0.70%		34.00%
Other Adjustments	(1.00%)		(0.30%)		1.00%
Effective Income Tax Rate	61.90%		44.60%		89.30%

[1] Primarily related to non-deductible share-based compensation expense.