Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 18,160	$ 32,895
Accounts receivable	117,319	137,217
Inventories	10,540	10,109
Prepaid income taxes	9,143	17,377
Prepaid expenses	29,589	32,688
Total current assets	184,751	230,286
Investments of deferred compensation plans	100,139	98,884
Properties and equipment, at cost, less accumulated depreciation of $326,154 (2021- $317,911)	192,405	193,680
Lease right of use asset	134,169	125,048
Identifiable intangible assets less accumulated amortization of $60,166 (2021 - $57,648)	106,367	108,096
Goodwill	579,704	578,591
Other assets	8,222	8,138
Total Assets	1,305,757	1,342,723
Current liabilities
Accounts payable	64,710	73,024
Income taxes	15,390	41
Accrued insurance	58,952	55,918
Accrued compensation	62,205	95,598
Accrued legal	871	872
Short-term lease liability	38,856	37,913
Other current liabilities	38,667	39,033
Total current liabilities	279,651	302,399
Deferred income taxes	19,136	23,183
Long-term debt	120,000	185,000
Deferred compensation liabilities	100,812	98,597
Long-term lease liability	109,121	100,629
Other liabilities	10,332	9,642
Total Liabilities	639,052	719,450
Commitments and contingencies (Note 10)
STOCKHOLDERS' EQUITY
Capital stock - authorized 80,000,000 shares $1 par; issued 36,578,650 shares (2021 - 36,513,857 shares)	36,579	36,514
Paid-in capital	1,064,448	1,044,341
Retained earnings	2,029,158	1,970,311
Treasury stock - 21,676,467 shares (2021 - 21,601,325 shares)	(2,465,716)	(2,430,094)
Deferred compensation payable in Company stock	2,236	2,201
Total Stockholders' Equity	666,705	623,273
Total Liabilities and Stockholders' Equity	$ 1,305,757	$ 1,342,723