Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Income (loss) from continuing operations	$ (97,073)	$ 94,284	$ 79,847
Income (loss) from discontinued operations	(424)	7,833	(58)
Net income (loss)	(97,497)	102,117	79,789
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation	7,394	20,879	34,194
Depreciation and amortization	20,867	22,605	23,087
Impairments, inventory write-down and other charges	132,579
Changes in value of life insurance policies	(894)	(2,899)	(874)
Deferred income taxes	(12,216)	(36,345)	1,832
Realization of pension obligation	188	(112)	2,257
Net provision for credit losses	1,618	754	692
Gain on sale of business		(1,154)
(Gain) loss on sale of discontinued operations	573	(8,411)
Other non-cash items	(683)	(200)	(159)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	46,421	(3,191)	2,265
Inventories	1,471	(3,892)	(10,403)
Prepaid expenses and other current assets	(2,296)	3,561	(9,048)
Other assets	(1,905)	(46)	6,264
Accounts payable	(12,838)	(3,757)	(1,752)
Accrued expenses	602	8,067	(6,903)
Unearned revenue	(7,924)	(5,513)	1,825
Other liabilities	(17,592)	(2,936)	(11,239)
Net cash provided by operating activities	57,868	89,527	111,827
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(11,880)	(22,269)	(21,741)
Patents and other intangibles	(498)	(180)	(1,190)
Acquisitions, net of cash acquired			(47,314)
Distribution received from life insurance policies	20,443
Proceeds from sale of assets	1,734	887	882
Proceeds from sale of business		2,980
Proceeds (payment) from sale of discontinued operations	(225)	14,789
Premiums on life insurance policies	(1,723)	(1,884)	(1,276)
Net cash provided by (used in) investing activities	7,851	(5,677)	(70,639)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of long-term debt	(102,000)	(123,000)	(114,000)
Proceeds from long-term debt	56,000	138,000	178,000
Debt financing costs	(1,536)		(1,760)
Dividends paid	(12,446)	(97,574)	(97,251)
Repurchase of common shares	(2,793)	(3,308)	(7,451)
Other financing activities	(230)	8	(10)
Net cash used in financing activities	(63,005)	(85,874)	(42,472)
NET CHANGE IN CASH AND CASH EQUIVALENTS	2,714	(2,024)	(1,284)
CASH AND CASH EQUIVALENTS, beginning of year	11,092	13,116	14,400
CASH AND CASH EQUIVALENTS, end of year	13,806	11,092	13,116
Supplemental disclosures of cash flow information:
Cash payments for interest	11,669	13,631	11,499
Cash payments for income taxes	21,325	13,804	31,928
Non-cash investing and financing activities:
Capital expenditures incurred but not paid for as of the end of the year	$ 1,064	$ 222	$ 628