Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Income from continuing operations	$ 40,298	$ 23,923
Income (loss) from discontinued operations, net of tax	259	(346)
Net income	40,557	23,577
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	11,096	6,291
Depreciation and amortization	5,587	5,818
Changes to value of life insurance policies	(1,771)	29
Deferred income taxes	(31,760)	(256)
Other non-cash items	(74)	98
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	(3,936)	(5,913)
Inventories	(4,407)	(3,686)
Prepaid expenses and other current assets	3,443	(901)
Other assets	(2,882)	742
Accounts payable	1,346	2,634
Accrued expenses	8,531	(2,281)
Unearned revenues	825	188
Other long-term liabilities	(1,399)	(3,247)
Net cash provided by operating activities	25,156	23,093
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(5,183)	(4,443)
Patents and other intangibles	86	(72)
Proceeds from sale of assets	311	280
Premiums on life insurance	(419)	(382)
Net cash used in investing activities	(5,205)	(4,617)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(32,000)	(29,000)
Proceeds from debt borrowings	37,000	37,000
Dividends paid	(24,374)	(24,322)
Repurchase of common shares	(487)	(3,310)
Net cash used in financing activities	(19,861)	(19,632)
NET CHANGE IN CASH AND CASH EQUIVALENTS	90	(1,156)
CASH AND CASH EQUIVALENTS, beginning of period	13,116	14,400
CASH AND CASH EQUIVALENTS, end of period	13,206	13,244
Supplemental disclosures of cash flow information:
Cash payments for interest	4,795	4,149
Cash payments for income taxes	$ 1,476	$ 4,056