Commitments And Contingencies (Schedule Of Commitments And Obligations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Commitments And Obligations [Line Items]
Total	$ 135,897
Less than 1 year	133,576
1 to 3 years	2,321
Purchase Obligations [Member]
Commitments And Obligations [Line Items]
Total	35,984
Less than 1 year	35,018
1 to 3 years	966
Guarantees [Member]
Commitments And Obligations [Line Items]
Total	77,762
Less than 1 year	77,007
1 to 3 years	755
Letters Of Credit [Member]
Commitments And Obligations [Line Items]
Total	22,151
Less than 1 year	21,551
1 to 3 years	$ 600