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Equity - Common Stock (Details)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Jul. 31, 2010
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]      
Shares authorized (in shares) 800,000 800,000 800,000
Shares outstanding at end of period (in shares) 490,359 411,953  
Shares held in treasury (in shares) 1,219 874