Consolidated Balance Sheet (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheet [Abstract]
Accounts receivable, allowances	$ 11,782	$ 11,524
Properties and equipment, at cost, accumulated depreciation	159,407	146,709
Identifiable intangible assets, accumulated amortization	$ 30,035	$ 28,904
Capital stock - authorized	80,000,000	80,000,000
Capital stock - par value	$ 1	$ 1
Capital stock - issued	31,450,817	30,936,925
Treasury stock	12,257,661	11,880,051