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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Cash flows from operating activities:    
Net income $ 26,487 $ 17,808
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 20,191 23,461
Provision for doubtful accounts 5,571 3,619
Stock-based compensation 5,983 5,146
Deferred income taxes 1,373 2,975
Other operating activities 102 2,022
Changes in operating assets and liabilities:    
Accounts receivable 888 11,925
Income tax receivable (3,641) 8,828
Other assets (3,522) 5,977
Accounts payable and other accrued expenses 3,767 (13,181)
Accrued wages and benefits (1,423) (4,560)
Workers’ compensation claims reserve (9,235) 767
Other liabilities 2,900 (580)
Net cash provided by operating activities 49,441 64,207
Cash flows from investing activities:    
Capital expenditures (6,468) (9,137)
Acquisition of business (22,742) 0
Divestiture of business 8,800 0
Purchases of restricted investments (10,730) (20,712)
Maturities of restricted investments 13,044 13,546
Net cash used in investing activities (18,096) (16,303)
Cash flows from financing activities:    
Payments for Repurchase of Common Stock (19,065) (15,530)
Net proceeds from stock option exercises and employee stock purchase plans 757 858
Common stock repurchases for taxes upon vesting of restricted stock (2,403) (2,873)
Net change in revolving credit facility 21,300 (25,303)
Payments on debt (22,856) (1,133)
Payment of contingent consideration at acquisition date fair value 0 (18,300)
Net cash used in financing activities (22,267) (62,281)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (919) (154)
Net change in cash, cash equivalents and restricted cash 8,159 (14,531)
Cash, cash equivalents and restricted cash, beginning of period 73,831 103,222
Cash, cash equivalents and restricted cash, end of period 81,990 88,691
Supplemental Cash Flow Information [Abstract]    
Interest 1,892 1,549
Income taxes 5,696 (4,740)
Property, plant, and equipment purchased but not yet paid 726 2,888
Divestiture non-cash consideration $ 1,657 $ 0