CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 43,455	$ 41,051
Other intangible assets, accumulated amortization	$ 61,405	$ 36,917
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	480,000,000	480,000,000
Common stock, shares issued	178,784,000	178,621,000
Common stock shares outstanding	143,455,000	146,458,000
Treasury stock, shares	35,329,000	32,163,000