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Rights Agreement (Details) (USD $)
2 Months Ended 103 Months Ended 120 Months Ended 134 Months Ended 11 Months Ended
Dec. 31, 2011
May 31, 2010
Nov. 13, 2011
Dec. 31, 2012
May 31, 2011
Stock Split B [Member]
Class of Stock [Line Items]          
Preferred Stock, Dividends Per Share, Declared       $ 1  
Stock Split Conversion Ratio   three-for-two     three-for-two
Amount Entitled To Purchase Share From Company Per Right three ten-thousandths (3/10,000)   four ten-thousandths (4/10,000)    
PriceperShareEntitledToPurchaseShareFromCompanyPerRight (in Dollars per share) $ 22.22   $ 33.33    
Business Acquisition, Percentage of Voting Interests Acquired 15.00%