Unaudited Consolidated Balance Sheet - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 13,753	$ 15,310
Accounts receivable less allowances of $16,193 (2016 - $14,236)	117,906	132,021
Inventories	5,618	5,755
Prepaid income taxes	4,537	3,709
Prepaid expenses	14,678	13,105
Total current assets	156,492	169,900
Investments of deferred compensation plans	58,579	54,389
Properties and equipment, at cost, less accumulated depreciation of $222,332 (2016 - $211,290)	140,209	121,302
Identifiable intangible assets less accumulated amortization of $32,827 (2016 - $33,225)	54,737	55,065
Goodwill	472,897	472,366
Deferred income taxes	20,593	8
Other assets	6,767	7,029
Total Assets	910,274	880,059
Current liabilities
Accounts payable	49,154	39,586
Current portion of long-term debt	10,000	8,750
Income taxes	3,815
Accrued insurance	44,905	47,960
Accrued compensation	48,082	53,979
Accrued legal	92,502	1,805
Other current liabilities	20,142	19,752
Total current liabilities	268,600	171,832
Deferred income taxes		14,291
Long-term debt	115,000	100,000
Deferred compensation liabilities	57,811	54,288
Other liabilities	15,780	15,549
Total Liabilities	457,191	355,960
Commitments and contingencies (Note 11)
Stockholders' Equity
Capital stock - authorized 80,000,000 shares $1 par; issued 34,470,426 shares (2016 - 34,270,104 shares)	34,470	34,270
Paid-in capital	661,553	639,703
Retained earnings	957,941	958,149
Treasury stock - 18,563,720 shares (2016 - 18,083,527)	(1,203,077)	(1,110,536)
Deferred compensation payable in Company stock	2,196	2,513
Total Stockholders' Equity	453,083	524,099
Total Liabilities and Stockholders' Equity	$ 910,274	$ 880,059