Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Real Estate Fund [Member]
Unobservable Quantitative Input [Abstract]
Opening Balance - changes in Level 3 " deferred compensation plan assets"	$ 549,091	$ 622,124	$ 667,710	$ 600,786
Purchases	725	7,406	3,392	38,299
Sales	(74,755)	(14,184)	(307,268)	(70,848)
Net unrealized gains	18,333	12,367	55,221	59,476
Net realized gains	51,584	8,184	126,653	8,184
Previously recorded unrealized gains	(49,586)	0	(50,316)	0
Other, Net	0	93	0	93
Closing Balance - changes in Level 3 " deferred compensation plan assets"	495,392	635,990	495,392	635,990
Real Estate Fund [Member] | Minimum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates			12.00%
Terminal capitalization rates			5.00%
Real Estate Fund [Member] | Maximum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates			17.50%
Terminal capitalization rates			6.30%
Real Estate Fund [Member] | Weighted Average [Member]
Unobservable Quantitative Input [Abstract]
Discount rates			13.70%
Terminal capitalization rates			5.80%
Deferred Compensation Plan Assets [Member]
Unobservable Quantitative Input [Abstract]
Opening Balance - changes in Level 3 " deferred compensation plan assets"	64,609	66,502	68,782	62,631
Purchases	1,377	880	10,936	4,027
Sales	(4,917)	(873)	(21,296)	(5,318)
Realized and unrealized gain (loss)	927	(42)	2,901	4,094
Other, Net	1,187	58	1,860	1,091
Closing Balance - changes in Level 3 " deferred compensation plan assets"	$ 63,183	$ 66,525	$ 63,183	$ 66,525