Business Changes And Developments (Summary Of Assets And Liabilities EAM) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Cash and Cash Equivalents	$ 182,905	$ 141,337	$ 206,682	$ 175,902
Accounts Receivable	52,060	49,625
Intangible Assets	40,909	49,232
Other Assets	11,718	8,972
Total Assets	1,043,592	898,085	891,160
Payable to Employees and Related Parties	12,647	4,181
Accrued Compensation and Benefits	125,869	82,943
Other Liabilities	15,490	22,956
Total Liabilities	555,499	505,438
EAM [Member]
Cash and Cash Equivalents	3,480	1,534
Accounts Receivable	303	606
Intangible Assets		1,073
Other Assets		60
Total Assets	3,783	3,273
Payable to Employees and Related Parties		2,987
Accrued Compensation and Benefits		574
Other Liabilities		207
Total Liabilities		$ 3,768