Derivative Financial Instruments (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Asset Derivatives	$ 1,463	$ 2,479
Liability Derivatives	17,115	9,919
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contract [Member]
Asset Derivatives	0	0
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]
Liability Derivatives	9,194	6,903
Not Designated as Hedging Instrument [Member] | Contracts In Process Or Billings In Excess Of Costs And Estimated Earnings On Uncompleted Contracts [Member] | Foreign Exchange Contract [Member]
Asset Derivatives	1,463	2,112
Liability Derivatives	7,706	2,978
Not Designated as Hedging Instrument [Member] | Other accounts receivable [Member] | Foreign Exchange Contract [Member]
Asset Derivatives	0	367
Not Designated as Hedging Instrument [Member] | Other accounts payable [Member] | Foreign Exchange Contract [Member]
Liability Derivatives	$ 215	$ 38