Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Trade receivables allowances	$ 9,425	$ 8,229
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	115,858,190	115,858,190
Common stock, shares outstanding	79,640,930	80,022,291
Treasury stock, shares at cost	36,217,260	35,835,899