Earnings per Share Earnings per Share (Textuals) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Preferred shares redeemed during period	2,000
Excess of fair value over book value of preferred shares subject to redemption	$ 2,190	$ 0
Preferred Stock Redemption Discount	(2,190)	0
Stock Issued During Period, Shares, New Issues	2,461,000
StockIssuedDuringPeriodPricePerShare	$ 23.50
Proceeds from Issuance of Common Stock	$ 54,617	$ 0