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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 25, 2015
Dec. 26, 2014
Dec. 27, 2013
Cash flows from operating activities:      
Net income $ 71,247 $ 65,675 $ 44,924
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation and amortization 41,843 29,474 20,472
Provision for doubtful accounts 7,132 11,815 12,063
Stock-based compensation 11,103 11,051 8,412
Deferred income taxes 5,176 12,663 (3,844)
Other operating activities 446 898 2,116
Changes in operating assets and liabilities:      
Accounts receivable (89,474) (77,629) (4,181)
Income tax receivable (16,678) (5,696) 4,113
Other assets (6,398) (7,361) (7,341)
Accounts payable and other accrued expenses 23,261 (8,683) (3,592)
Accrued wages and benefits 12,203 12,069 (3,643)
Workers’ compensation claims reserve 14,736 1,579 9,859
Other liabilities (2,525) 1,670 6,710
Net cash provided by operating activities 72,072 47,525 86,068
Cash flows from investing activities:      
Capital expenditures (18,394) (16,918) (13,003)
Acquisition of businesses, net of cash acquired (67,500) (305,876) (77,560)
Purchases of marketable securities 0 (25,057) (40,800)
Sales and maturities of marketable securities 1,500 44,167 20,050
Change in restricted cash and cash equivalents 18,374 (9,283) (16,122)
Purchases of restricted investments (51,516) (18,196) (13,411)
Maturities of restricted investments 12,510 12,726 15,581
Net cash used in investing activities (105,026) (318,437) (125,265)
Cash flows from financing activities:      
Net proceeds from stock option exercises and employee stock purchase plans 1,563 2,191 9,136
Common stock repurchases for taxes upon vesting of restricted stock (3,869) (3,114) (2,800)
Net change in revolving credit facility 46,091 171,994 0
Proceeds from long-term debt 0 0 34,000
Payments on debt and other liabilities (2,078) (2,267) (8,681)
Other 1,079 978 713
Net cash provided by financing activities 42,786 169,782 32,368
Effect of exchange rate changes on cash and cash equivalents 283 (1,207) (681)
Net change in cash and cash equivalents 10,115 (102,337) (7,510)
CASH AND CASH EQUIVALENTS, beginning of period 19,666 122,003 129,513
CASH AND CASH EQUIVALENTS, end of period $ 29,781 $ 19,666 $ 122,003