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Shareholders' Equity Common stock dividends declared (Tables) (Capital Gain [Member])
 12 Months Ended
Dec. 31, 2013
Capital Gain [Member]
  
Tax characterization of dividends declared [Line Items]  
Common dividends declared [Table Text Block]
The following table summarizes dividends declared per share of common stock for years ending December 31, 2013, 2012, and 2011 and their related tax characterization:
 
 
 
Tax Characterization
 
Dividends Declared per Common Share
 
Ordinary
 
Capital Gain
 
Return of Capital
Year ended December 31, 2013
$
1.1200

 
$
1.0650

 
$
0.0550

 
$
—

Year ended December 31, 2012
1.1500

 
1.0038

 
0.1462

 
—

Year ended December 31, 2011
1.0900

 
0.9822

 
0.1078

 
—