Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheet [Abstract]
Accounts receivable, allowances	$ 12,033	$ 13,332
Properties and equipment, accumulated depreciation	142,067	132,696
Identifiable intangible assets, accumulated amortization	$ 28,530	$ 27,438
Capital stock - authorized	80,000,000	80,000,000
Capital stock - par value	$ 1	$ 1
Capital stock - issued	30,913,424	30,381,863
Treasury stock	11,128,851	9,103,185