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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Cash flows from operating activities:    
Net income $ 8,276 $ 8,755
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,952 10,090
Provision for doubtful accounts 1,778 2,209
Stock-based compensation 3,606 3,409
Deferred income taxes 3,209 1,370
Non-cash lease expense 3,565 0
Other operating activities (1,841) (572)
Changes in operating assets and liabilities:    
Accounts receivable 26,558 42,679
Income tax receivable (3,645) (2,842)
Other assets (5,274) (1,964)
Accounts payable and other accrued expenses (9,878) (5,232)
Accrued wages and benefits (10,266) (10,125)
Workers’ compensation claims reserve (4,380) (4,579)
Operating lease liabilities 3,414 0
Other liabilities 3,268 1,637
Net cash provided by operating activities 21,514 44,835
Cash flows from investing activities:    
Capital expenditures (5,862) (1,911)
Divestiture of business 0 8,500
Purchases of restricted investments (3,070) (3,299)
Maturities of restricted investments 10,337 6,417
Net cash provided by investing activities 1,405 9,707
Cash flows from financing activities:    
Payments for Repurchase of Common Stock (5,303) 0
Net proceeds from employee stock purchase plans 380 395
Common stock repurchases for taxes upon vesting of restricted stock (1,438) (2,086)
Net change in revolving credit facility (37,800) (46,301)
Payments on debt 0 (567)
Other (69) 0
Net cash used in financing activities (44,230) (48,559)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 314 (760)
Net change in cash, cash equivalents and restricted cash (20,997) 5,223
Cash, cash equivalents and restricted cash, beginning of period 102,450 73,831
Cash, cash equivalents and restricted cash, end of period 81,453 79,054
Supplemental Cash Flow Information [Abstract]    
Interest 667 827
Income taxes 1,448 2,342
Operating lease liabilities 4,344 0
Property and equipment purchased but not yet paid 807 581
Divestiture non-cash consideration 0 1,957
Right-of-use assets obtained in exchange for new operating lease liabilities $ 4,698 $ 0