CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2017	Mar. 25, 2016
Cash flows from operating activities:
Net income	$ 4,674	$ 6,968
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	11,174	11,289
Provision for doubtful accounts	1,446	1,308
Stock-based compensation	3,304	3,179
Deferred income taxes	726	(1,083)
Other operating activities	937	1,014
Changes in operating assets and liabilities:
Accounts receivable	49,077	147,067
Income tax receivable	9,565	14,742
Other assets	3,627	(3,668)
Accounts payable and other accrued expenses	(15,015)	(9,681)
Accrued wages and benefits	(16,071)	(16,153)
Workers’ compensation claims reserve	(1,957)	3,731
Other liabilities	2,488	1,792
Net cash provided by operating activities	53,975	160,505
Cash flows from investing activities:
Capital expenditures	(6,167)	(3,876)
Acquisition of business	0	(72,000)
Change in restricted cash and cash equivalents	14,039	(3,592)
Purchases of restricted investments	(14,975)	(11,222)
Maturities of restricted investments	4,423	3,164
Net cash used in investing activities	(2,680)	(87,526)
Cash flows from financing activities:
Net proceeds from stock option exercises and employee stock purchase plans	491	477
Common stock repurchases for taxes upon vesting of restricted stock	(2,400)	(2,229)
Net change in Revolving Credit Facility	(57,367)	(78,988)
Payments on debt	(567)	(756)
Other	0	171
Net cash used in financing activities	(59,843)	(81,325)
Effect of exchange rate changes on cash and cash equivalents	(339)	453
Net change in cash and cash equivalents	(8,887)	(7,893)
CASH AND CASH EQUIVALENTS, beginning of period	34,970	29,781
CASH AND CASH EQUIVALENTS, end of period	26,083	21,888
Supplemental Cash Flow Information [Abstract]
Interest	755	1,321
Income taxes	(8,487)	(12,983)
Property, plant, and equipment purchased but not yet paid	1,161	2,087
Non-cash acquisition adjustments	$ 0	$ 4,610