Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheet [Abstract]
Accounts receivable, allowances	$ 11,376	$ 11,524
Properties and equipment, at cost, accumulated depreciation	151,451	146,709
Identifiable intangible assets, accumulated amortization	$ 29,278	$ 28,904
Capital stock - authorized	80,000,000	80,000,000
Capital stock - par value	$ 1	$ 1
Capital stock - issued	31,063,058	30,936,925
Treasury stock	11,931,736	11,880,051