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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Cash flows from operating activities:    
Net income $ 50,867 $ 39,029
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 30,777 34,650
Provision for doubtful accounts 10,140 6,321
Stock-based compensation 9,552 6,161
Deferred income taxes 2,638 4,890
Other operating activities 526 2,724
Changes in operating assets and liabilities:    
Accounts receivable (17,960) (34,198)
Income tax receivable (5,389) 12,788
Other assets (12,110) 6,306
Accounts payable and other accrued expenses 1,624 (784)
Accrued wages and benefits 4,724 (176)
Workers’ compensation claims reserve (8,405) 1,985
Other liabilities 1,642 1,086
Net cash provided by operating activities 68,626 80,782
Cash flows from investing activities:    
Capital expenditures (10,313) (16,303)
Acquisition of business (22,742) 0
Divestiture of business 10,414 0
Purchases of restricted investments (11,747) (36,015)
Maturities of restricted investments 17,021 15,042
Net cash used in investing activities (17,367) (37,276)
Cash flows from financing activities:    
Payments for Repurchase of Common Stock (24,818) (29,371)
Net proceeds from employee stock purchase plans and stock options exercised 1,146 1,179
Common stock repurchases for taxes upon vesting of restricted stock (2,539) (2,956)
Net change in revolving credit facility 12,000 (1,099)
Payments on debt (22,855) (1,700)
Payment of contingent consideration at acquisition date fair value 0 (18,300)
Net cash used in financing activities (37,066) (52,247)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (583) 364
Net change in cash, cash equivalents and restricted cash 13,610 (8,377)
Cash, cash equivalents and restricted cash, beginning of period 73,831 103,222
Cash, cash equivalents and restricted cash, end of period 87,441 94,845
Supplemental Cash Flow Information [Abstract]    
Interest 3,395 2,612
Income taxes 9,832 (2,972)
Property, plant, and equipment purchased but not yet paid 1,229 2,863
Divestiture non-cash consideration $ 971 $ 0