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Noncontrolling Interests (Preferred Stockholders' Equity in Subsidiaries) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Noncontrolling Interest [Line Items]      
Preferred Stock, Value, Issued $ 4 $ 4 $ 4
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 25.00% 25.00%  
Noncontrolling Interest, Ownership Percentage by Parent 75.00% 75.00%  
Preferred Stock, Dividend Rate, Percentage 4.00%   4.00%
Document Period End Date   Jun. 30, 2013  
Redeemable Preferred Stock Member
     
Noncontrolling Interest [Line Items]      
Shares, Outstanding 300,000 300,000  
Preferred Stock, Value, Issued $ 300,000 $ 300,000  
Preferred Stock, Dividend Rate, Percentage 6.125%    
Preferred stock-perpetual voting, dividend increase percentage each interval once shares become callable 50.00%