CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net loss	$ (14,508)	$ (53,425)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	15,229	14,759
Stock-based compensation expense	5,100	6,265
Restructuring and other charges	5,744	23,218
Gain on sale of property, plant and equipment	(494)	(3,873)
Deferred income taxes	1,098	(695)
Changes in operating assets and liabilities:
Trade receivables, net	13,396	26,450
Unbilled receivables	(28,434)	(5,082)
Inventories, net	4,663	(12,700)
Prepaids and other assets	(11,432)	14,375
Accounts payable and accrued expenses	(10,560)	15,123
Other, net	(11)	0
Net cash provided by (used in) operating activities	(20,209)	24,415
Investing activities
Purchase of property, plant and equipment	(3,429)	(5,625)
Proceeds from sale of property, plant and equipment	582	5,950
Net cash provided by (used in) investing activities	(2,847)	325
Financing activities
Repurchase of common shares	(9,657)	0
Other	(83)	(77)
Net cash used in financing activities	(9,740)	(77)
Effect of exchange rate changes on cash activities	(1,871)	(137)
Increase (decrease) in cash and cash equivalents	(34,667)	24,526
Cash and cash equivalents at beginning of period	355,451	345,955
Cash and cash equivalents at end of period	$ 320,784	$ 370,481