CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net loss	$ (19,698)	$ (6,051)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	8,873	8,356
Stock-based compensation expense	3,176	4,862
Impairments	7,719
Restructuring and other charges	32,713	1,271
Gain on sale of assets	(467)	(13)
Deferred income taxes	(10,862)	(73)
Changes in operating assets and liabilities:
Trade receivables, net	(19,444)	15,768
Unbilled receivables	11,224	(21,365)
Inventories, net	(15,537)	(2,700)
Prepaids and other assets	(11,723)	15,960
Accounts payable and accrued expenses	(7,212)	(14,478)
Other, net	1	(699)
Net cash provided by (used in) operating activities	(21,237)	838
Investing activities
Purchase of property, plant and equipment	(4,187)	(3,527)
Proceeds from sale of equipment	687	341
Net cash used in investing activities	(3,500)	(3,186)
Financing activities
Repurchase of common shares	(25,000)	(1,116)
Other	(85)
Net cash used in financing activities	(25,085)	(1,116)
Effect of exchange rate changes on cash activities	(5,652)	172
Decrease in cash and cash equivalents	(55,474)	(3,292)
Cash and cash equivalents at beginning of period	398,946	418,100
Cash and cash equivalents at end of period	$ 343,472	$ 414,808