Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Income from continuing operations	$ 79,847	$ 80,985	$ 65,024
Income (loss) from discontinued operations, net of tax	(58)	2,111	(1,165)
Net income	79,789	83,096	63,859
Adjustments to reconcile income to net cash provided by operating activities:
Stock-based compensation	34,194	22,942	22,079
Depreciation and amortization	23,087	24,524	26,872
Changes to value of life insurance policies	(874)	(6,112)	(824)
Deferred income taxes	1,832	9,015	(14,385)
Realization of pension obligation	2,257	(724)	(1,243)
Net (recovery) provision for doubtful accounts	692	(202)	(18)
Other non-cash items	(159)	217	345
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	2,265	(18,565)	31,584
Inventories	(10,403)	446	6,219
Prepaid expenses and other current assets	(9,048)	(4,549)	2,657
Other assets	6,264	545	340
Accounts payable	(1,752)	8,721	(1,036)
Accrued expenses	(6,903)	(6,775)	(6,738)
Other long-term liabilities	(11,239)	10,313	587
Unearned revenue	1,825	1,379	1,589
Net cash provided by operating activities	111,827	124,271	131,887
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(21,741)	(18,775)	(11,356)
Patents and other intangibles	(1,190)	(379)	(348)
Acquisitions, net of cash acquired	(47,314)	0	(1,242)
Proceeds from sale of assets	882	702	740
Premiums on life insurance	(1,276)	(2,105)	(2,515)
Net cash used in investing activities	(70,639)	(20,557)	(14,721)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(114,000)	(130,000)	(316,244)
Proceeds from debt borrowings	178,000	140,000	99,000
Excess tax benefits from stock-based payments	0	0	(1,162)
Debt financing costs	(1,760)	0	0
Non-controlling interest - dividend	(10)	(26)	(1,386)
Dividends paid	(97,251)	(97,143)	(95,145)
Repurchase of common shares	(7,451)	(16,909)	(7,161)
Issuance of common shares	0	0	197,202
Net cash used in financing activities	(42,472)	(104,078)	(124,896)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1,284)	(364)	(7,730)
CASH AND CASH EQUIVALENTS, beginning of year	14,400	14,764	22,494
CASH AND CASH EQUIVALENTS, end of year	13,116	14,400	14,764
Supplemental disclosures of cash flow information:
Cash payments for interest	11,499	10,527	11,248
Cash payments for income taxes	31,928	24,314	12,181
Non-cash investing and financing activities:
Capital expenditures incurred but not paid for as of the end of the year	$ 628	$ 744	$ 1,627