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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Cash flows from operating activities: |  |
Net income | $ 37,386 | $ 31,804
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 3,912 | 3,831
Bad debt provision | 2,150 | 1,675
Deferred income tax (benefit) expense | 2,541 | (1,466)
Stock-based compensation expense | 2,091 | 1,733
Tax benefit from equity compensation plans, gross | (1,107) | (817)
Amortization of premium on marketable securities | 663 | 185
Unrealized gain on deferred compensation fund investments | (82) | (482)
Changes in operating assets and liabilities: |  |
Accounts and notes receivable | (43,190) | (6,879)
Inventories and supplies | (1,295) | 69
Prepaid expenses and other assets | (4,787) | (2,199)
Deferred compensation funding | (971) | (243)
Accounts payable and other accrued expenses | 552 | (9,479)
Accrued payroll, accrued and withheld payroll taxes | 9,329 | (4,854)
Accrued insurance claims | 4,448 | 6,354
Deferred compensation liability | 1,473 | 952
Income taxes payable | 7,098 | 13,329
Net cash provided by operating activities | 20,211 | 33,513
Cash flows from investing activities: |  |
Disposals of fixed assets | 127 | 67
Additions to property and equipment | (2,954) | (2,289)
Purchases of marketable securities | (14,628) | (3,025)
Sales of marketable securities | 6,284 | 2,813
Net cash used in investing activities | (11,171) | (2,434)
Cash flows from financing activities: |  |
Dividends paid | (26,451) | (25,415)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan | 57 | 54
Tax benefit from equity compensation plans, gross | 1,107 | 817
Proceeds from the exercise of stock options | 4,777 | 4,085
Net cash used in financing activities | (20,510) | (20,459)
Net change in cash and cash equivalents | (11,470) | 10,620
Cash and cash equivalents at beginning of the period | 33,189 | 75,280
Cash and cash equivalents at end of the period | 21,719 | 85,900
Supplementary Cash Flow Information: |  |
Cash paid for interest | 254 | 35
Cash paid for income taxes, net of refunds | $ 12,262 | $ 7,643

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: 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 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=63488584&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=66902209&loc=d3e3602-108585 + 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=66902209&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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