Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 9,066	$ 4,831
Accounts receivable	114,480	119,504
Inventories	7,354	5,705
Prepaid income taxes	10,745	10,646
Prepaid expenses	26,150	19,154
Total current assets	167,795	159,840
Investments of deferred compensation plans	73,714	65,624
Properties and equipment, at cost, less accumulated depreciation of $264,075 (2018 - $248,370)	172,932	162,033
Lease right of use asset	103,286
Identifiable intangible assets less accumulated amortization of $34,651 (2018 - $33,283)	129,276	68,253
Goodwill	576,600	510,570
Other assets	8,982	9,209
Total Assets	1,232,585	975,529
Current liabilities
Accounts payable	44,027	50,150
Accrued insurance	47,726	46,095
Accrued compensation	75,208	63,329
Accrued legal	7,283	1,857
Short-term lease liability	33,761
Other current liabilities	43,496	30,239
Total current liabilities	251,501	191,670
Deferred income taxes	15,512	21,598
Long-term debt	130,000	89,200
Deferred compensation liabilities	73,335	64,616
Long-term lease liability	82,012
Other liabilities	7,845	17,111
Total Liabilities	560,205	384,195
Commitments and contingencies (Note 11)
STOCKHOLDERS' EQUITY
Capital stock - authorized 80,000,000 shares $1 par; issued 35,737,995 shares (2018 - 35,311,418 shares)	35,738	35,311
Paid-in capital	841,837	774,358
Retained earnings	1,365,303	1,225,617
Treasury stock - 19,808,981 shares (2018 - 19,438,358 shares)	(1,572,844)	(1,446,296)
Deferred compensation payable in Company stock	2,346	2,344
Total Stockholders' Equity	672,380	591,334
Total Liabilities and Stockholders' Equity	$ 1,232,585	$ 975,529