Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 20,376	$ 6,158
Accounts receivable less allowances of $1,425 (2019 -$353)	132,487	143,827
Inventories	7,467	7,462
Prepaid income taxes	5,794	10,074
Prepaid expenses	23,183	23,150
Total current assets	189,307	190,671
Investments of deferred compensation plans	80,113	77,446
Properties and equipment, at cost, less accumulated depreciation of $281,237 (2019 - $270,140)	183,017	175,763
Lease right of use asset	128,418	111,652
Identifiable intangible assets less accumulated amortization of $42,584 (2019 - $37,620)	122,791	126,370
Goodwill	578,491	577,367
Other assets	9,055	9,048
Total Assets	1,291,192	1,268,317
Current liabilities
Accounts payable	36,704	51,101
Income taxes	19,576
Accrued insurance	50,847	50,328
Accrued compensation	80,552	70,814
Accrued legal	6,959	6,941
Short-term lease liability	36,093	39,280
Unutilized CARES Act grant	39,236
Other current liabilities	48,549	43,756
Total current liabilities	318,516	262,220
Deferred income taxes	21,108	18,504
Long-term debt		90,000
Deferred compensation liabilities	77,639	76,446
Long-term lease liability	104,444	86,656
Other liabilities	18,789	7,883
Total Liabilities	540,496	541,709
Commitments and contingencies (Note 11)
STOCKHOLDERS' EQUITY
Capital stock - authorized 80,000,000 shares $1 par; issued 36,039,794 shares (2019 - 35,810,528 shares)	36,040	35,811
Paid-in capital	904,421	860,671
Retained earnings	1,553,144	1,425,752
Treasury stock - 20,198,753 shares (2019 - 19,867,220 shares)	(1,745,299)	(1,597,940)
Deferred compensation payable in Company stock	2,390	2,314
Total Stockholders' Equity	750,696	726,608
Total Liabilities and Stockholders' Equity	$ 1,291,192	$ 1,268,317