Commitments And Contingencies (Asbestos Liability Tables) (Details) (USD $)	6 Months Ended		3 Months Ended				6 Months Ended				12 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Asbestos Commitments And Contingencies [Member]		Jun. 30, 2010 Asbestos Commitments And Contingencies [Member]		Jun. 30, 2011 Asbestos Commitments And Contingencies [Member]		Jun. 30, 2010 Asbestos Commitments And Contingencies [Member]		Dec. 31, 2010 Asbestos Commitments And Contingencies [Member]		Jun. 30, 2011 Asbestos Commitments And Contingencies [Member] Maritime Claims [Member]	Dec. 31, 2010 Asbestos Commitments And Contingencies [Member] Maritime Claims [Member]	Dec. 31, 2009 Asbestos Commitments And Contingencies [Member] Maritime Claims [Member]
Beginning claims			64,646		67,479		64,839		66,341		66,341
New claims			893		824		1,858		1,737		5,032
Settlements			(263)		(242)		(603)		(532)		(1,127)
Dismissals			(8,873)		(2,709)		(9,690)		(3,151)		(6,363)
MARDOC claims							(1)		957		956		955
Ending claims			56,403		65,352		56,403		65,352		64,839
Maritime actions														8
Claims permanently dismissed													11,256
Remaining Claims													24,245
Settlement/indemnity costs incurred			$ 13,900,000	[1]	$ 10,600,000	[1]	$ 30,100,000	[1]	$ 26,100,000	[1]	$ 52,700,000	[1]
Defense costs incurred			14,700,000	[1]	13,900,000	[1]	26,100,000	[1]	25,900,000	[1]	53,900,000	[1]
Total cost incurred			28,600,000		24,500,000		56,200,000		52,000,000		106,600,000
Settlement/indemnity payments			13,000,000		10,000,000		21,500,000		22,500,000		46,900,000
Defense payments			16,700,000		13,900,000		27,400,000		25,400,000		54,400,000
Insurance receipts			(6,800,000)		(7,500,000)		(13,300,000)		(20,400,000)		(34,600,000)
Pre-tax cash payments	$ 35,621,000	$ 27,485,000	$ 22,900,000		$ 16,400,000		$ 35,600,000		$ 27,500,000		$ 66,700,000
Total Number Of Maritime Claims															36,448

[1] Before insurance recoveries and tax effects