Credit Facilities, Short-term Borrowings and Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010		Dec. 31, 2010 Bank Borrowings [Member]
Short-term Borrowings
Bank borrowings	$ 0	$ 285,500	$ 0
Total	$ 0	$ 285,500	$ 0	[1]
Maturity					3 - 74 days
Weighted-average interest rate					0.59%

[1] As Restated, See Note 1