Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Income from continuing operations	$ 94,284	$ 79,847	$ 80,985
Income (loss) from discontinued operations, net of tax	7,833	(58)	2,111
Net income	102,117	79,789	83,096
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	20,879	34,194	22,942
Depreciation and amortization	22,605	23,087	24,524
Changes to value of life insurance policies	(2,899)	(874)	(6,112)
Deferred income taxes	(36,345)	1,832	9,015
Realization of pension obligation	(112)	2,257	(724)
Net (recovery) provision for doubtful accounts	754	692	(202)
Gain on sale of business	(1,154)
Gain on sale of discontinued operations	(8,411)
Other non-cash items	(200)	(159)	217
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(3,191)	2,265	(18,565)
Inventories	(3,892)	(10,403)	446
Prepaid expenses and other current assets	3,561	(9,048)	(4,549)
Other assets	(46)	6,264	545
Accounts payable	(3,757)	(1,752)	8,721
Accrued expenses	8,067	(6,903)	(6,775)
Other long-term liabilities	(2,936)	(11,239)	10,313
Unearned revenue	(5,513)	1,825	1,379
Net cash provided by operating activities	89,527	111,827	124,271
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(22,269)	(21,741)	(18,775)
Patents and other intangibles	(180)	(1,190)	(379)
Acquisitions, net of cash acquired		(47,314)
Proceeds from sale of assets	887	882	702
Proceeds from sale of business	2,980
Proceeds from sale of business of discontinued operations	14,789
Premiums on life insurance	(1,884)	(1,276)	(2,105)
Net cash used in investing activities	(5,677)	(70,639)	(20,557)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(123,000)	(114,000)	(130,000)
Proceeds from debt borrowings	138,000	178,000	140,000
Debt financing costs		(1,760)
Dividends paid	(97,574)	(97,251)	(97,143)
Repurchase of common shares	(3,308)	(7,451)	(16,909)
Other financing activities	8	(10)	(26)
Net cash used in financing activities	(85,874)	(42,472)	(104,078)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(2,024)	(1,284)	(364)
CASH AND CASH EQUIVALENTS, beginning of year	13,116	14,400	14,764
CASH AND CASH EQUIVALENTS, end of year	11,092	13,116	14,400
Supplemental disclosures of cash flow information:
Cash payments for interest	13,631	11,499	10,527
Cash payments for income taxes	13,804	31,928	24,314
Non-cash investing and financing activities:
Capital expenditures incurred but not paid for as of the end of the year	$ 222	$ 628	$ 744