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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 54,358 $ 50,867
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 28,528 30,777
Provision for doubtful accounts 5,997 10,140
Stock-based compensation 8,119 9,552
Deferred income taxes 1,058 2,638
Non-cash lease expense 11,087 0
Other operating activities (1,701) 526
Changes in operating assets and liabilities:    
Accounts receivable (17,616) (17,960)
Income tax receivable (3,982) (5,389)
Other assets (9,449) (12,110)
Accounts payable and other accrued expenses (6,970) 3,179
Accrued wages and benefits (141) 4,549
Workers’ compensation claims reserve (7,176) (8,405)
Operating lease liabilities (11,297) 0
Other liabilities 1,723 262
Net cash provided by operating activities 52,538 68,626
Cash flows from investing activities:    
Capital expenditures (18,297) (10,313)
Acquisition of business 0 (22,742)
Divestiture of business 215 10,414
Purchases of restricted investments (22,597) (11,747)
Maturities of restricted investments 28,976 17,021
Net cash used in investing activities (11,703) (17,367)
Cash flows from financing activities:    
Purchases and retirement of common stock (31,316) (24,818)
Net proceeds from employee stock purchase plans 1,023 1,146
Common stock repurchases for taxes upon vesting of restricted stock (1,934) (2,539)
Net change in revolving credit facility (36,200) 12,000
Payments on debt 0 (22,855)
Other (203) 0
Net cash used in financing activities (68,630) (37,066)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 732 (583)
Net change in cash, cash equivalents and restricted cash (27,063) 13,610
Cash, cash equivalents and restricted cash, beginning of period 102,450 73,831
Cash, cash equivalents and restricted cash, end of period 75,387 87,441
Supplemental Cash Flow Information [Abstract]    
Interest 1,767 3,395
Income taxes 9,230 9,832
Operating lease liabilities 13,280 0
Property and equipment purchased but not yet paid 945 1,229
Divestiture non-cash consideration 0 971
Right-of-use assets obtained in exchange for new operating lease liabilities $ 10,825 $ 0