Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Consolidated Balance Sheet [Abstract]
Accounts receivable, allowances	$ 12,555	$ 10,892
Properties and equipment, at cost, accumulated depreciation	178,720	164,607
Identifiable intangible assets, accumulated amortization	$ 31,633	$ 30,414
Capital stock - authorized	80,000,000	80,000,000
Capital stock - par value	$ 1	$ 1
Capital stock - issued	32,085,561	31,589,366
Treasury stock	14,548,735	13,057,270