Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Real Estate Fund
Unobservable Quantitative Input [Abstract]
Opening Balance - changes in Level 3 " deferred compensation plan assets"	$ 682,002	$ 571,306	$ 667,710	$ 600,786
Purchases	2,544	17,225	2,667	30,893
Sales/Returns	(232,513)	0	(232,513)	(56,664)
Net unrealized gains	57,354	33,593	58,546	47,109
Net realized gains	75,069	0	75,069	0
Previously recorded unrealized gains	(35,365)	0	(22,388)	0
Closing Balance - changes in Level 3 " deferred compensation plan assets"	549,091	622,124	549,091	622,124
Real Estate Fund | Minimum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates			12.00%
Terminal capitalization rates			5.00%
Real Estate Fund | Maximum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates			17.50%
Terminal capitalization rates			6.20%
Real Estate Fund | Weighted Average [Member]
Unobservable Quantitative Input [Abstract]
Discount rates			14.50%
Terminal capitalization rates			5.60%
Deferred Compensation Plan Assets [Member]
Unobservable Quantitative Input [Abstract]
Opening Balance - changes in Level 3 " deferred compensation plan assets"	67,627	65,010	68,782	62,631
Purchases	7,915	440	9,559	3,147
Sales/Returns	(11,255)	(1,748)	(16,379)	(4,445)
Realized and unrealized gain	(198)	2,782	1,974	4,136
Other, Net	520	18	673	1,033
Closing Balance - changes in Level 3 " deferred compensation plan assets"	$ 64,609	$ 66,502	$ 64,609	$ 66,502