Consolidated Balance Sheets Unaudited - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 28,743	$ 162,675
Accounts receivable	118,193	126,853
Inventories	8,394	7,095
Prepaid income taxes	12,940	6,603
Prepaid expenses	32,294	26,177
Total current assets	200,564	329,403
Investments of deferred compensation plans	102,045	88,811
Properties and equipment, at cost, less accumulated depreciation of $310,972 (2020 - $293,380)	190,781	187,820
Lease right of use asset	127,077	123,448
Identifiable intangible assets less accumulated amortization of $55,138 (2020 - $47,607)	110,606	118,085
Goodwill	578,610	578,585
Other assets	8,450	8,759
Total Assets	1,318,133	1,434,911
Current liabilities
Accounts payable	60,042	54,234
Income taxes	180	9,464
Accrued insurance	52,645	54,703
Accrued compensation	97,256	91,282
Accrued legal	1,497	10,632
Short-term lease liability	35,148	36,200
Other current liabilities	39,318	42,593
Total current liabilities	286,086	299,108
Deferred income taxes	20,100	20,664
Deferred compensation liabilities	100,409	88,456
Long-term lease liability	104,198	99,210
Other liabilities	27,621	26,273
Total Liabilities	538,414	533,711
Commitments and contingencies (Note 10)
STOCKHOLDERS' EQUITY
Capital stock - authorized 80,000,000 shares $1 par; issued 36,402,025 shares (2020 - 36,258,638 shares)	36,402	36,259
Paid-in capital	1,007,506	961,404
Retained earnings	1,901,245	1,723,777
Treasury stock - 21,073,917 shares (2020 - 20,351,562 shares)	(2,167,640)	(1,822,579)
Deferred compensation payable in Company stock	2,206	2,339
Total Stockholders' Equity	779,719	901,200
Total Liabilities and Stockholders' Equity	$ 1,318,133	$ 1,434,911