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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income $ 63,073 $ 65,754 $ 55,456
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 37,549 41,049 46,115
Provision for doubtful accounts 7,661 10,042 6,808
Stock-based compensation 9,769 13,876 7,744
Deferred income taxes 1,263 (1,929) 2,440
Non-cash lease expense 14,823 0 0
Other operating activities (1,589) 5,154 2,349
Changes in operating assets and liabilities, net of amounts acquired and divested:      
Accounts receivable 5,450 11,640 (28,483)
Income tax receivable (6,480) (996) 14,875
Other assets (12,575) (12,928) 5,289
Accounts payable and other accrued expenses 6,921 3,029 (7,657)
Accrued wages and benefits (9,494) (1,613) (2,713)
Workers’ compensation claims reserve (10,828) (7,877) (1,048)
Operating lease liabilities (15,178) 0 0
Other liabilities 3,166 491 (1,041)
Net cash provided by operating activities 93,531 125,692 100,134
Cash flows from investing activities:      
Capital expenditures (28,119) (17,054) (21,958)
Acquisition of businesses, net of cash acquired 0 (22,742) 0
Divestiture of business 215 10,587 0
Payments for (Proceeds from) Life Insurance Policies (12,210) 0 0
Purchases of restricted available-for-sale investments (7,667) (6,173) (5,907)
Sales and maturities of restricted available-for-sale investments 20,859 1,991 2,897
Purchases of restricted held-to-maturity investments (22,963) (6,768) (44,694)
Maturities of restricted held-to-maturity investments 28,254 19,644 17,260
Other 0 0 (1,979)
Net cash used in investing activities (21,631) (20,515) (54,381)
Cash flows from financing activities:      
Purchases and retirement of common stock (38,826) (34,818) (36,680)
Net proceeds from employee stock purchase plans 1,329 1,503 1,646
Common stock repurchases for taxes upon vesting of restricted stock (2,222) (3,404) (3,127)
Net change in revolving credit facility (42,900) (15,900) (16,607)
Payments on debt 0 (22,397) (2,267)
Payment of contingent consideration at acquisition date fair value 0 0 (18,300)
Other (296) 0 0
Net cash used in financing activities (82,915) (75,016) (75,335)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 936 (1,542) 191
Net change in cash, cash equivalents and restricted cash (10,079) 28,619 (29,391)
Cash, cash equivalents and restricted cash, beginning of period 102,450 73,831 103,222
Cash, cash equivalents and restricted cash, end of period 92,371 102,450 73,831
Interest 2,432 4,373 3,811
Income taxes 12,166 12,898 4,593
Operating lease liabilities 17,643 0 0
Property and equipment purchased but not yet paid 993 1,553 375
Divestiture non-cash consideration 0 798 0
Right-of-use assets obtained in exchange for new operating lease liabilities $ 18,759 $ 0 $ 0