Subsequent Events (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 29, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Common Stock, Dividends, Per Share, Declared	$ 0.185	$ 0.74	$ 0.74
Common Stock, Dividends, Per Share, Cash Paid	$ 10,700,000
Stock Repurchased During Period, Shares	0.2
Stock Repurchased During Period, Value	$ 7,300	$ 53,414	$ 11,165	$ 59,124