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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 26, 2015 | Jun. 27, 2014
Cash flows from operating activities: |  |
Net income | $ 22,989 | $ 17,739
Adjustments to reconcile net income to net cash from operating activities: |  |
Depreciation and amortization | 20,917 | 10,408
Provision for doubtful accounts | 3,976 | 6,286
Stock-based compensation | 5,769 | 4,987
Deferred income taxes | (1,537) | (4,088)
Other operating activities | 678 | (54)
Changes in operating assets and liabilities: |  |
Accounts receivable | 31,906 | (15,180)
Income taxes | 5,035 | 3,647
Other assets | 1,474 | (66)
Accounts payable and other accrued expenses | 5,919 | (566)
Accrued wages and benefits | 2,603 | 5,291
Workers’ compensation claims reserve | 4,463 | (792)
Other liabilities | 2,506 | 1,310
Net cash provided by operating activities | 106,698 | 28,922
Cash flows from investing activities: |  |
Capital expenditures | (7,459) | (6,113)
Purchases of marketable securities | 0 | (25,057)
Sales and maturities of marketable securities | 1,500 | 36,175
Change in restricted cash and cash equivalents | 8,227 | 19,007
Purchases of restricted investments | (12,959) | (18,196)
Maturities of restricted investments | 7,504 | 7,202
Net cash provided by (used in) investing activities | (3,187) | 13,018
Cash flows from financing activities: |  |
Net proceeds from stock option exercises and employee stock purchase plans | 837 | 1,349
Common stock repurchases for taxes upon vesting of restricted stock | (3,183) | (2,665)
Net change in revolving credit facility | (98,500) | 0
Payments on debt and other liabilities | (1,133) | (1,133)
Other | 961 | 1,269
Net cash used in financing activities | (101,018) | (1,180)
Effect of exchange rate changes on cash and cash equivalents | (871) | 86
Net change in cash and cash equivalents | 1,622 | 40,846
CASH AND CASH EQUIVALENTS, beginning of period | 19,666 | 122,003
CASH AND CASH EQUIVALENTS, end of period | $ 21,288 | $ 162,849

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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 + Details
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Period Type: | duration

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- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the sale of investments that are pledged or subject to withdrawal restrictions during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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