Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 72,956	$ 69,531
Accounts receivable less allowances of $11,933 (2012 - $10,892)	127,220	93,333
Inventories	6,559	7,058
Current deferred income taxes	14,816	13,659
Prepaid income taxes	2,159	2,643
Prepaid expenses	12,539	11,447
Total current assets	236,249	197,671
Investments of deferred compensation plans	39,144	36,089
Properties and equipment, at cost, less accumulated depreciation of $169,719 (2012- $164,607)	90,374	91,934
Identifiable intangible assets less accumulated amortization of $30,791 (2012 - $30,414)	56,798	57,177
Goodwill	465,734	465,832
Other assets	11,110	10,923
Total Assets	899,409	859,626
LIABILITIES
Accounts payable	48,496	48,472
Income taxes	12,912	4,938
Accrued insurance	43,041	40,654
Accrued compensation	38,552	45,457
Other current liabilities	17,917	17,301
Total current liabilities	160,918	156,822
Deferred income taxes	28,155	27,662
Long-term debt	177,004	174,890
Deferred compensation liabilities	38,481	35,599
Other liabilities	11,762	11,362
Total Liabilities	416,320	406,335
STOCKHOLDERS' EQUITY
Capital stock - authorized 80,000,000 shares $1 par; issued 31,956,848 shares (2012 - 31,589,366 shares)	31,957	31,589
Paid-in capital	457,790	437,364
Retained earnings	641,946	623,035
Treasury stock - 13,185,316 shares (2012 - 13,057,270)	(650,668)	(640,732)
Deferred compensation payable in Company stock	2,064	2,035
Total Stockholders' Equity	483,089	453,291
Total Liabilities and Stockholders' Equity	$ 899,409	$ 859,626