Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Trade receivables allowances	$ 8,128	$ 9,147
Common stock, par value, in dollars per share	$ 0.125	$ 0.125
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	115,995,113	115,858,190
Common stock, shares outstanding	80,862,556	80,777,590
Treasury stock, shares at cost	35,132,557	35,080,600