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Net Income Per Common Share (Narrative) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
May 15, 2013
Dec. 31, 2010
Public Offering [Member]
tMEDS [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Units issued       13,800,000
Common stock, shares issued 916,207,848 792,272,692 122,800,000  
Number of anti-dilituve shares 28,500,000 35,000,000