Condensed Consolidated Statements Of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 3,852	$ 13,773
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	9,301	9,319
Amortization	2,891	2,853
Provision for doubtful accounts	0	(1,661)
Deferred income taxes	(885)	685
Asset impairments	1,007	0
(Gain) loss on the sale of property, plant and equipment	(31)	2
Stock-based compensation expense	2,739	2,772
Changes in operating assets and liabilities, net of effects from business acquisition:
Accounts receivable	6,414	64,176
Contract assets	1,099	(16,943)
Inventories	(23,769)	(5,862)
Prepaid expenses and other assets	(3,110)	3,056
Accounts payable	14,882	(45,914)
Accrued liabilities	(17,166)	(11,044)
Operating leases	(83)	543
Income taxes	(250)	659
Net cash provided by (used in) operations	(3,109)	16,414
Cash flows from investing activities:
Additions to property, plant and equipment	(11,856)	(9,326)
Proceeds from the sale of property, plant and equipment	7	1
Additions to purchased software	(1,040)	(748)
Cash received from business divestitures	1,341	0
Other	57	(98)
Net cash used in investing activities	(11,491)	(10,171)
Cash flows from financing activities:
Proceeds from stock options exercised	359	279
Employee taxes paid for shares withheld	(1,767)	(1,236)
Dividends paid	(5,538)	(6,203)
Borrowings under credit agreement	110,000	0
Principal payments on long-term debt	(17,187)	(274)
Share repurchases	(19,329)	(61,080)
Net cash provided by (used in) financing activities	66,538	(68,514)
Effect of exchange rate changes	(4,108)	(515)
Net increase (decrease) in cash and cash equivalents and restricted cash	47,830	(62,786)
Cash and cash equivalents and restricted cash at beginning of period	363,956	458,102
Cash and cash equivalents and restricted cash at end of period	$ 411,786	$ 395,316