Credit Facilities and Short-term Borrowings (Short-term Borrowings and Availability Under Various Short-term Credit Facilities) (Details) (USD $) In Thousands	Sep. 30, 2011
Total availability	$ 250,541
Outstanding letters of credit and guarantees	(7,612)
Remaining availability	242,929
Foreign Pooling Arrangement Facility [Member]
Total availability	5,279
Remaining availability	5,279
Foreign Performance Guarantee Facilities [Member]
Total availability	9,736
Outstanding letters of credit and guarantees	(2,730)
Remaining availability	7,006
Foreign Lines of Credit And Overdraft Facilities [Member]
Total availability	10,526
Remaining availability	10,526
Revolving Credit Facility [Member]
Total availability	225,000
Outstanding letters of credit and guarantees	(4,882)
Remaining availability	$ 220,118