CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net Income (Loss)	$ (1,240)	$ (1,219)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	21,837	22,352
Stock-based compensation expense	7,719	7,669
Restructuring and other charges	(1,148)	6,119
Gain on sale of property, plant and equipment	(8,412)	(17,770)
Acquisition costs	4,585	0
Deferred income taxes	1,612	1,538
Changes in operating assets and liabilities:
Trade receivables, net	(22,461)	16,980
Unbilled receivables	(12,440)	(38,097)
Inventories, net	(18,783)	2,255
Prepaids and other assets	16,750	(8,854)
Accounts payable and accrued expenses	(6,423)	(10,124)
Other, net	0	(16)
Net cash used in operating activities	(18,404)	(19,167)
Cash flows from investing activities:
Purchase of property, plant and equipment	(21,041)	(13,712)
Proceeds from sale of property, plant and equipment	17,291	18,535
Acquisition of Great North, net of cash acquired	(82,287)	0
Purchase of short-term investments	(22,978)	(25,287)
Maturities of short-term investments	46,299	0
Net cash used in investing activities	(62,716)	(20,464)
Cash flows from financing activities:
Repurchase of common shares	0	(20,807)
Other	(41)	(74)
Net cash used in financing activities	(41)	(20,881)
Effect of exchange rate changes on cash activities	(2,571)	(4,660)
Decrease in cash and cash equivalents	(83,732)	(65,172)
Cash and cash equivalents at beginning of period	264,804	355,451
Cash and cash equivalents at end of period	$ 181,072	$ 290,279