Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Cash flows from operating activities:
Net income (loss)	$ 27,607	$ (17,276)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on disposal of discontinued operation	0	(35)
Loss on extinguishment of debt	1,761	0
Impairment charges related to indefinite lived intangibles	0	3,949
(Gain) loss from sale of property, plant and equipment	(65)	88
Depreciation and amortization	12,567	12,956
Share-based compensation expense	3,523	3,611
Non-cash inventory related charges	1,110	1,603
Deferred income taxes	280	(2,706)
Changes in accrued retiree medical benefits	(81)	254
Changes in other accrued liabilities	(78)	(106)
Changes in other assets	62	605
Amortization of cloud-based software implementation costs	370	205
Interest capitalized associated with cloud computing implementation	(43)	(45)
Amortization of debt discounts and issuance costs	250	290
Changes in assets and liabilities:
Customer advances	882	14,434
Accounts receivable	(47,241)	17,078
Inventories	(20,804)	(6,067)
Other current assets	(6,629)	(5,888)
Accounts payable	28,486	55
Deferred profit	4,383	1,619
Income taxes payable	5,131	7,454
Accrued compensation, warranty and other liabilities	(5,457)	(14,313)
Operating lease right-of-use assets	1,556	1,843
Current and long-term operating lease liabilities	(1,427)	(1,795)
Net cash provided by operating activities	6,143	17,813
Cash flows from investing activities:
Net cash received from sale of fixtures services business	0	2,975
Cash received from sale of property, plant and equipment	98	74
Purchases of short-term investments	(129,736)	0
Sales and maturities of short-term investments	2,481	0
Purchases of property, plant and equipment	(2,700)	(1,584)
Net cash provided by (used in) investing activities	(129,857)	1,465
Cash flows from financing activities:
Cash dividends paid	0	(2,483)
Issuance (repurchases) of common stock, net	(5,421)	253
Proceeds from revolving line of credit and construction loans	818	1,117
Proceeds received from issuance of common stock, net of fees	223,118	0
Repayments of long-term debt	(101,922)	(1,133)
Net cash provided by (used in) financing activities	116,593	(2,246)
Effect of exchange rate changes on cash and cash equivalents	882	(1,488)
Net increase (decrease) in cash and cash equivalents	(6,239)	15,544
Cash and cash equivalents at beginning of period	149,358	155,930
Cash and cash equivalents at end of period	143,119	171,474
Supplemental disclosure of cash flow information:
Cash paid for income taxes	279	690
Inventory capitalized as property, plant and equipment	455	238
Dividends declared but not yet paid	0	2,488
Property, plant and equipment purchases included in accounts payable	862	3,370
Capitalized cloud computing service costs included in accounts payable	757	1,552
Cash paid for interest	$ 2,532	$ 7,308