Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 34,214	$ 38,081
Accounts receivable less allowances of $11,376 (2011 - $11,524)	110,656	77,924
Inventories	8,468	8,668
Current deferred income taxes	13,725	12,540
Prepaid income taxes	637	2,131
Prepaid expenses	9,576	11,409
Total current assets	177,276	150,753
Investments of deferred compensation plans	35,055	31,629
Properties and equipment, at cost, less accumulated depreciation of $151,451 (2011 - $146,709)	88,579	82,951
Identifiable intangible assets less accumulated amortization of $29,278 (2011 - $28,904)	57,941	58,262
Goodwill	461,064	460,633
Other assets	11,568	11,677
Total Assets	831,483	795,905
LIABILITIES
Accounts payable	52,999	48,225
Income taxes	13,334	90
Accrued insurance	37,305	37,147
Accrued compensation	35,834	41,087
Other current liabilities	15,724	18,851
Total current liabilities	155,196	145,400
Deferred income taxes	27,256	29,463
Long-term debt	168,759	166,784
Deferred compensation liabilities	34,186	30,693
Other liabilities	11,629	9,881
Total Liabilities	397,026	382,221
STOCKHOLDERS' EQUITY
Capital stock - authorized 80,000,000 shares $1 par; issued 31,063,058 shares (2011 - 30,936,925 shares)	31,063	30,937
Paid-in capital	404,546	398,094
Retained earnings	564,130	546,757
Treasury stock - 11,931,736 shares (2011 - 11,880,051 shares), at cost	(567,279)	(564,091)
Deferred compensation payable in Company stock	1,997	1,987
Total Stockholders' Equity	434,457	413,684
Total Liabilities and Stockholders' Equity	$ 831,483	$ 795,905