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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 income (loss) attributable to Nabors | $ 94,760 | $ 61,301
Adjustments to net income (loss): |  |
Depreciation and amortization | 543,637 | 508,748
Depletion and other oil and gas expenses | 14,182 | 151
Deferred income tax expense (benefit) | (20,720) | (15,404)
Impairments and other charges | 34,983 | 159,950
Losses (gains) on investments, net | (91,140) | (21,400)
Share-based compensation | 38,824 | 8,784
Foreign currency transaction losses (gains), net | 7,311 | 2,285
Gain on sale of oil and gas operations |  | (48,486)
Equity in (earnings) losses of unconsolidated affiliates, net of dividends | (3,891) | 202,985
Other | 15,422 | 12,586
Changes in operating assets and liabilities, net of effects from acquisitions: |  |
Accounts receivable | 22,556 | (33,981)
Inventory | 13,893 | 6,636
Other current assets | (3,402) | (26,906)
Other long-term assets | 25,820 | 6,693
Trade accounts payable and accrued liabilities | 38,216 | (94,423)
Income taxes payable | (28,834) | (33,147)
Other long-term liabilities | (36,209) | 15,565
Net cash provided by operating activities | 665,408 | 711,937
Cash flows from investing activities: |  |
Purchases of investments |  | (795)
Sales and maturities of investments | 163,161 | 25,517
Proceeds from sales of unconsolidated affiliates | 10,000 |
Investment in unconsolidated affiliate | (3,927) |
Cash paid for acquisition of businesses, net | (37,516) |
Capital expenditures | (500,368) | (967,861)
Proceeds from sales of assets and insurance claims | 29,731 | 116,923
Other | (3,142) |
Net cash used for investing activities | (342,061) | (826,216)
Cash flows from financing activities: |  |
Increase (decrease) in cash overdrafts | (8,686) | (2,060)
Dividends to shareholders | (23,552) |
Proceeds from debt | 11,569 |
Debt issuance costs | (87) |
Proceeds from revolving credit facility |  | 200,000
Proceeds from (payments for) commercial paper, net | 295,000 |
Proceeds from (payments for) issuance of common shares | 3,200 | (5,066)
Reduction in long-term debt | (17,853) | (1,235)
Reduction in revolving credit facility | (590,000) | (150,000)
Purchase of restricted stock | (3,023) | (2,071)
Tax (expense) benefit related to share-based awards |  | (36)
Net cash (used for) provided by financing activities | (333,432) | 39,532
Effect of exchange rate changes on cash and cash equivalents | (6,709) | (3,430)
Net increase (decrease) in cash and cash equivalents | (16,794) | (78,177)
Cash and cash equivalents, beginning of period | 524,922 | 398,575
Cash and cash equivalents, end of period | $ 508,128 | $ 320,398

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- Definition The cash outflow for the settlement of obligation drawn 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 maturities due beyond one year or the operating cycle, if longer. + 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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -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 4: 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. + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 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=6943989&loc=d3e3602-108585 + Details
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