Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 3,323	$ 4,831
Accounts receivable	136,113	119,504
Inventories	6,336	5,705
Prepaid income taxes	12,951	10,646
Prepaid expenses	21,455	19,154
Total current assets	180,178	159,840
Investments of deferred compensation plans	70,460	65,624
Properties and equipment, at cost, less accumulated depreciation of $259,495 (2018 - $248,370)	149,917	162,033
Assets held for sale	15,750
Lease right of use assets less accumulated amortization of $13,415	90,755
Identifiable intangible assets less accumulated amortization of $34,210 (2018 - $33,284)	67,511	68,253
Goodwill	510,627	510,570
Other assets	8,874	9,209
Total Assets	1,094,072	975,529
Current liabilities
Accounts payable	51,143	50,150
Accrued insurance	46,912	46,095
Accrued compensation	50,123	63,329
Accrued legal	8,431	1,857
Short-term lease liability	31,614
Other current liabilities	35,446	30,239
Total current liabilities	223,669	191,670
Deferred income taxes	18,828	21,598
Long-term debt	85,000	89,200
Deferred compensation liabilities	70,273	64,616
Long-term lease liability	69,979
Other liabilities	7,754	17,111
Total Liabilities	475,503	384,195
Commitments and contingencies (Note 11)
STOCKHOLDERS' EQUITY
Capital stock - authorized 80,000,000 shares $1 par; issued 35,590,832 shares (2018 - 35,311,418 shares)	35,591	35,311
Paid-in capital	817,255	774,358
Retained earnings	1,311,446	1,225,617
Treasury stock - 19,749,166 shares (2018 - 19,438,358)	(1,548,138)	(1,446,296)
Deferred compensation payable in Company stock	2,415	2,344
Total Stockholders' Equity	618,569	591,334
Total Liabilities and Stockholders' Equity	$ 1,094,072	$ 975,529