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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICALS) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 23,874 $ 22,288
Cumulative preferred stock, par value (in dollars per share) $ 5 $ 5
Cumulative preferred stock, shares authorized 12,000,000 12,000,000
Cumulative preferred stock, shares issued 0 0
Cumulative preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.5 $ 0.5
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 109,659,219 109,659,219
Treasury stock, shares at cost 48,337,040 47,630,511