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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Book overdrafts $ 60,547 $ 32,586
Preferred stock, par value (usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 25,000,000 25,000,000
Preferred stock, shares issued 0 0
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 349,148,351 369,458,530
Common stock, shares outstanding 349,148,351 369,458,530