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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Cash flows from operating activities: |  |
Net income | $ 28,560 | $ 27,887
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 3,581 | 2,707
Bad debt provision | 1,550 | 650
Deferred income taxes (benefits) | 1,486 | (1,305)
Stock-based compensation expense | 1,531 | 1,196
Amortization of premium on marketable securities | 174 | 303
Unrealized gain on deferred compensation fund investments | (888) | (759)
Changes in operating assets and liabilities: |  |
Accounts and notes receivable | (16,695) | (26,812)
Inventories and supplies | (472) | 27
Prepaid expenses and other assets | (4,191) | (1,085)
Deferred compensation funding | (1,803) | (1,926)
Accounts payable and other accrued expenses | (1,942) | 8,454
Accrued payroll, accrued and withheld payroll taxes | (3,338) | (1,989)
Accrued insurance claims | 740 | 1,137
Deferred compensation liability | 3,031 | 2,922
Income taxes payable | 3,503 | 2,573
Net cash provided by operating activities | 14,827 | 13,980
Cash flows from investing activities: |  |
Disposals of fixed assets | 363 | 150
Additions to property and equipment | (2,738) | (1,702)
Purchases of marketable securities | (1,937) | (4,597)
Sales of marketable securities | 2,115 | 3,450
Net cash used in investing activities | (2,197) | (2,699)
Cash flows from financing activities: |  |
Dividends paid | (24,263) | (22,931)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan | 28 | 53
Tax benefit from equity compensation plans | 885 | 1,128
Proceeds from the exercise of stock options | 3,834 | 4,680
Net cash used in financing activities | (19,516) | (17,070)
Net change in cash and cash equivalents | (6,886) | (5,789)
Cash and cash equivalents at beginning of the period | 64,155 | 68,949
Cash and cash equivalents at end of the period | 57,269 | 63,160
Supplementary Cash Flow Information: |  |
Cash paid for interest | 73 | 0
Cash paid for income taxes, net of refunds | 10,737 | 8,531
Issuance of Common Stock in 2014 and 2013, respectively, pursuant to Employee Stock Purchase Plan | $ 1,851 | $ 1,842

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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 -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: 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=31042434&loc=d3e3255-108585 + 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + 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=31042434&loc=d3e3602-108585 + Details
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- Definition Aggregate change in value for stock issued during the period as a result of employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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