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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |  |  |  |
Net income | $ 162,664 us-gaap_ProfitLoss |  | $ 188,009 us-gaap_ProfitLoss |  | $ 299,477 us-gaap_ProfitLoss |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |
Depreciation, depletion, amortization and impairment | 718,730 pten_DepreciationDepletionAmortizationAndImpairment |  | 597,469 pten_DepreciationDepletionAmortizationAndImpairment |  | 526,614 pten_DepreciationDepletionAmortizationAndImpairment |
Provision for bad debts | 0 us-gaap_ProvisionForDoubtfulAccounts |  | 0 us-gaap_ProvisionForDoubtfulAccounts |  | 1,100 us-gaap_ProvisionForDoubtfulAccounts |
Dry holes and abandonments | 550 us-gaap_ExplorationAbandonmentAndImpairmentExpense |  | 89 us-gaap_ExplorationAbandonmentAndImpairmentExpense |  | 308 us-gaap_ExplorationAbandonmentAndImpairmentExpense |
Deferred income tax expense | 43,673 us-gaap_DeferredIncomeTaxExpenseBenefit |  | 50,569 us-gaap_DeferredIncomeTaxExpenseBenefit |  | 160,436 us-gaap_DeferredIncomeTaxExpenseBenefit |
Stock-based compensation expense | 27,032 us-gaap_ShareBasedCompensation |  | 25,891 us-gaap_ShareBasedCompensation |  | 23,185 us-gaap_ShareBasedCompensation |
Net gain on asset disposals | (15,781)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | [1] | (3,384)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | [1] | (33,806)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | [1]
Tax expense related to stock-based compensation |  |  |  |  | (1,284)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities |
Changes in operating assets and liabilities: |  |  |  |  |  |
Accounts receivable | (214,059)us-gaap_IncreaseDecreaseInAccountsReceivable |  | 12,007 us-gaap_IncreaseDecreaseInAccountsReceivable |  | 52,612 us-gaap_IncreaseDecreaseInAccountsReceivable |
Income taxes receivable/payable | (92,352)pten_IncreaseDecreaseInIncomeTaxesReceivableAndPayable |  | 4,447 pten_IncreaseDecreaseInIncomeTaxesReceivableAndPayable |  | 3,506 pten_IncreaseDecreaseInIncomeTaxesReceivableAndPayable |
Inventory and other assets | (5,737)us-gaap_IncreaseDecreaseInInventoriesAndOtherOperatingAssets |  | 570 us-gaap_IncreaseDecreaseInInventoriesAndOtherOperatingAssets |  | 5,276 us-gaap_IncreaseDecreaseInInventoriesAndOtherOperatingAssets |
Accounts payable | 86,621 us-gaap_IncreaseDecreaseInAccountsPayable |  | 11,331 us-gaap_IncreaseDecreaseInAccountsPayable |  | (25,199)us-gaap_IncreaseDecreaseInAccountsPayable |
Accrued expenses | 12,838 us-gaap_IncreaseDecreaseInAccruedLiabilities |  | 1,973 us-gaap_IncreaseDecreaseInAccruedLiabilities |  | (6,048)us-gaap_IncreaseDecreaseInAccruedLiabilities |
Other liabilities | 4,547 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities |  | (100)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities |  | (837)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities |
Net cash provided by operating activities | 728,726 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |  | 888,871 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |  | 1,005,340 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |
Cash flows from investing activities: |  |  |  |  |  |
Acquisitions | (176,301)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |
Purchases of property and equipment | (1,052,341)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | (662,461)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | (973,988)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
Proceeds from disposal of assets | 33,233 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  | 10,386 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  | 66,027 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |
Net cash used in investing activities | (1,195,409)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |  | (652,075)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |  | (907,961)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |
Cash flows from financing activities: |  |  |  |  |  |
Purchases of treasury stock | (13,554)us-gaap_PaymentsForRepurchaseOfCommonStock |  | (73,510)us-gaap_PaymentsForRepurchaseOfCommonStock |  | (170,292)us-gaap_PaymentsForRepurchaseOfCommonStock |
Dividends paid | (58,288)us-gaap_PaymentsOfDividends |  | (29,112)us-gaap_PaymentsOfDividends |  | (30,302)us-gaap_PaymentsOfDividends |
Tax benefit related to stock-based compensation | 8,729 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  | 4,794 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |  |
Proceeds from long-term debt |  |  |  |  | 400,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt |
Repayment of long-term debt | (10,000)us-gaap_RepaymentsOfLongTermDebt |  | (6,250)us-gaap_RepaymentsOfLongTermDebt |  | (93,750)us-gaap_RepaymentsOfLongTermDebt |
Proceeds from borrowings under revolving credit facility | 349,500 us-gaap_ProceedsFromLongTermLinesOfCredit |  |  |  | 123,400 us-gaap_ProceedsFromLongTermLinesOfCredit |
Repayment of borrowings under revolving credit facility | (46,500)us-gaap_RepaymentsOfLongTermLinesOfCredit |  |  |  | (233,400)us-gaap_RepaymentsOfLongTermLinesOfCredit |
Debt issuance costs |  |  |  |  | (7,581)us-gaap_PaymentsOfDebtIssuanceCosts |
Proceeds from exercise of stock options | 30,842 us-gaap_ProceedsFromStockOptionsExercised |  | 6,959 us-gaap_ProceedsFromStockOptionsExercised |  | 934 us-gaap_ProceedsFromStockOptionsExercised |
Net cash provided by (used in) financing activities | 260,729 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations |  | (97,119)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations |  | (10,991)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations |
Effect of foreign exchange rate changes on cash | (543)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents |  | (891)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents |  | 389 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents |
Net increase (decrease) in cash and cash equivalents | (206,497)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | 138,786 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | 86,777 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
Cash and cash equivalents at beginning of year | 249,509 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 110,723 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 23,946 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Cash and cash equivalents at end of year | 43,012 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 249,509 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 110,723 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Net cash paid during the year for: |  |  |  |  |  |
Interest, net of capitalized interest of $6,883 in 2014, $7,775 in 2013 and $8,673 in 2012 | (27,813)us-gaap_InterestPaidNet |  | (26,228)us-gaap_InterestPaidNet |  | (16,651)us-gaap_InterestPaidNet |
Income taxes | (125,953)us-gaap_IncomeTaxesPaidNet |  | (42,600)us-gaap_IncomeTaxesPaidNet |  | (7,964)us-gaap_IncomeTaxesPaidNet |
Non-cash investing and financing activities: |  |  |  |  |  |
Net increase (decrease) in payables for purchases of property and equipment | 122,148 us-gaap_CapitalExpendituresIncurredButNotYetPaid |  | (26,899)us-gaap_CapitalExpendituresIncurredButNotYetPaid |  | (27,838)us-gaap_CapitalExpendituresIncurredButNotYetPaid |
Net (increase) decrease in deposits on equipment purchases | $ (59,819)pten_NetDecreaseIncreaseInDepositsOnEquipmentPurchases |  | $ (8,784)pten_NetDecreaseIncreaseInDepositsOnEquipmentPurchases |  | $ 55,767 pten_NetDecreaseIncreaseInDepositsOnEquipmentPurchases |
[1] | Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term 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 (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond 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 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow 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 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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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 cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + 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=31042434&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 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&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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