Share Repurchase Programs (Details) (USD $) In Thousands, except Share data, unless otherwise specified			3 Months Ended
	Dec. 31, 2012 December 2011 Anti-Dilutive Share Repurchase Program [Member]	Dec. 31, 2009 December 2009 Anti-Dilutive Share Repurchase Program [Member]	Mar. 31, 2012 December Two Thousand Eleven Anti Dilutive Share Repurchase Program [Member] [Member]	Mar. 31, 2012 Common Stock [Member]
Accelerated Share Repurchases [Line Items]
Maximum number of share repurchases authorization	2,000,000
Repurchased and retired shares				223,200
Aggregate cost of repurchased and retired			$ 11,900
Maximum period of discretionary share repurchase program		2 years