Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Cash flows from operating activities:
Net income	$ 9,742	$ 17,429
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,810	20,415
Amortization of loan costs	217	406
Asset impairment	11,355	2,082
Deferred income tax expense (benefit)	(282)	5,910
Stock based compensation expense	2,093	2,976
Inventory adjustments	1,695	1,319
Credit loss expense	448	2,021
Other	1,014	1,041
Changes in operating assets and liabilities:
Accounts receivable	16,431	(9,307)
Inventories	(4,511)	2,767
Other assets	4,372	5,791
Accounts payable	19,171	1,445
Deferred revenue	509	4,684
Other liabilities	(1,004)	24,035
Net cash provided by operating activities	86,060	83,014
Cash flows from investing activities:
Purchase of property and equipment	(13,053)	(25,992)
Other	199	186
Net cash used for investing activities	(12,854)	(25,806)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net of discounts	146,269	0
Proceeds from exercise of stock options	5,120	513
Principal payments on long-term debt	0	(1,250)
Purchase of treasury stock	(74)	0
Payments on finance lease obligations	(714)	(617)
Net cash provided by (used for) financing activities	150,601	(1,354)
Net change in cash, cash equivalents and restricted cash	223,807	55,854
Cash, cash equivalents and restricted cash, beginning of year	40,307	17,998
Cash, cash equivalents and restricted cash, end of period	264,114	73,852
Supplemental cash flow disclosure information:
Cash paid for interest	7,065	9,857
Capital expenditures accrued at the end of the period	12,176	13,980
Right of use assets acquired under finance leases	1,244	7,270
Right of use assets acquired under operating leases	$ 17,658	$ 32,981