Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	898,168		889,511
Treasury Stock Acquired, Average Cost Per Share	$ 13.76	$ 15.37	$ 14.13
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings		79,968	43,174	25,817
Shares Repurchased to date		5,853,975
2008 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount		$ 90,000
2012 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount		$ 50,000