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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Cash Flows from Operating Activities: |  |
Net income | $ 103,516 | $ 103,837
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 32,944 | 28,089
Provision for uncollectible accounts | 1,448 | 788
Benefit of deferred income taxes | (2,055) | (5,225)
Share-based compensation expense | 9,642 | 8,820
Other | 417 | 110
Tax benefit from share-based compensation arrangements | (8,746) | (7,960)
Changes in assets and liabilities: |  |
Accounts receivable | (57,126) | (9,786)
Inventories | (16,023) | (5,575)
Other assets | 32,792 | (2,950)
Accounts payable | (2,992) | 337
Accrued liabilities | (27,589) | (3,344)
Deferred revenue | (706) | 8,139
Net cash provided by operating activities | 65,522 | 115,280
Cash Flows from Investing Activities: |  |
Purchases of property and equipment | (46,873) | (25,410)
Purchase of marketable securities | (190,370) |
Proceeds from the sale and maturities of marketable securities | 10,039 |
Proceeds from sale of equity investment |  | 5,400
Acquisitions of a businesses, net of cash acquired | (383) | (1,161)
Acquisition of intangible asset |  | (175)
Net cash used by investing activities | (227,587) | (21,346)
Cash Flows from Financing Activities: |  |
(Repayments) borrowings on revolving credit facilities, net | (51,000) | 107,000
Debt issue costs | (127) | (1,156)
Issuance of long term debt | 250,097 |
Payment of notes payable |  | (1,394)
Repurchases of common stock | (220,097) | (196,626)
Proceeds from exercises of stock options and employee stock purchase plans | 15,650 | 14,707
Tax benefit from share-based compensation arrangements | 8,746 | 7,960
Net cash provided (used) by financing activities | 3,269 | (69,509)
Net effect of changes in exchange rates on cash | (588) | 1,565
Net (decrease) increase in cash and cash equivalents | (159,384) | 25,990
Cash and cash equivalents at beginning of period | 322,536 | 279,058
Cash and cash equivalents at end of period | $ 163,152 | $ 305,048

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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + 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 to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + 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 (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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