Equity (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended
	Nov. 09, 2012	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Nov. 08, 2012	Mar. 31, 2012	Feb. 10, 2012	Dec. 31, 2011
Common Stock Repurchase Authorized
Stock Repurchase Shares Authorized		3.9	3.9		3.5	5.0		2.2
Share repurchase authorization increase							2.8
Treasury Stock, Shares, Acquired	0.5	0.7	1.1
Treasury stock acquired in accounts payable			$ 0	$ 768