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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Cash flows from operating activities: |  |
Net earnings | $ 230,057 | $ 212,500
Adjustments to reconcile net earnings to net cash provided by operating activities: |  |
Depreciation of property and equipment | 30,969 | 25,712
Gain on sale of property and equipment | (456) | (108)
Bad debt expense | 4,336 | 4,791
Deferred income taxes | (220) | 4,154
Stock based compensation | 2,700 | 2,100
Excess tax benefits from stock based compensation | (2,093) | (8,103)
Amortization of non-compete agreements | 158 | 297
Changes in operating assets and liabilities: |  |
Trade accounts receivable | (68,629) | (66,190)
Inventories | (9,724) | (16,537)
Other current assets | (8,515) | 1,242
Accounts payable | 11,734 | 7,464
Accrued expenses | 13,135 | 7,317
Income taxes | 16,558 | 16,023
Other | (6,145) | (231)
Net cash provided by operating activities | 213,865 | 190,431
Cash flows from investing activities: |  |
Purchase of property and equipment | (92,561) | (50,980)
Proceeds from sale of property and equipment | 2,904 | 1,325
Net increase in marketable securities | (83) | (1)
Decrease (increase) in other assets | 37 | (87)
Net cash used in investing activities | (89,703) | (49,743)
Cash flows from financing activities: |  |
Borrowings under line of credit | 30,000 | 0
Payments against line of credit | (30,000) | 0
Proceeds from exercise of stock options | 7,118 | 20,201
Excess tax benefits from stock based compensation | 2,093 | 8,103
Payment of dividends | (89,000) | (100,529)
Net cash used in financing activities | (79,789) | (72,225)
Effect of exchange rate changes on cash | (1,131) | (223)
Net increase in cash and cash equivalents | 43,242 | 68,240
Cash and cash equivalents at beginning of period | 79,611 | 117,676
Cash and cash equivalents at end of period | 122,853 | 185,916
Supplemental disclosure of cash flow information: |  |
Cash paid during each period for interest | 37 | 0
Cash paid during each period for income taxes | $ 120,716 | $ 113,810

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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