Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 112,827	$ 103,507
Operating activities:
Net income	29,733	33,992
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,617	25,100
(Gain) loss on disposition of property, plant and equipment	(123)	91
Stock compensation expense	2,552	3,021
Seeger divestiture charges	6,620	0
Changes in assets and liabilities, net of the effects of divestitures:
Accounts receivable	9,592	4,345
Inventories	(12,788)	7,300
Prepaid expenses and other current assets	(3,227)	(2,670)
Accounts payable	1,328	(9,179)
Accrued liabilities	(7,885)	(4,708)
Deferred income taxes	462	(872)
Long-term retirement benefits	(3,518)	(3,428)
Other	821	68
Net cash provided by operating activities	47,184	53,060
Investing activities:
Proceeds from disposition of property, plant and equipment	185	322
Proceeds from the sale of businesses, net of cash sold	36,879	0
Restricted Cash Provided by (Used in) Investing Activities	(6,621)	0
Capital expenditures	(11,912)	(13,738)
Net cash provided (used) in investing activities	18,531	(13,416)
Financing activities:
Net change in other borrowings	20,775	20,903
Payments on long-term debt	(83,521)	(152,195)
Proceeds from the issuance of long-term debt	50,000	102,990
Proceeds from the issuance of common stock	183	986
Common stock repurchases	(15,550)	0
Dividends paid	(8,133)	(8,217)
Withholding taxes paid on stock issuances	(84)	(80)
Other	(7,252)	(1,340)
Net cash used in financing activities	(43,582)	(36,953)
Effect of exchange rate changes on cash flows	(3,111)	97
Increase in cash and cash equivalents	19,022	$ 2,788
Cash and cash equivalents at beginning of period	93,805
Cash and cash equivalents at end of period	$ 112,827