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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Treasury Stock
Beginning Balance at Dec. 31, 2011 $ 2,516,631us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 1,833us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 840,731us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,279,367us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 19,459us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ (624,759)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Beginning Balance (in shares) at Dec. 31, 2011   183,295,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income 299,477us-gaap_ProfitLoss     299,477us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Foreign currency translation adjustment 2,308us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax       2,308us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Issuance of restricted stock (in shares)   792,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of restricted stock   8us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(8)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Vesting of restricted stock units (in shares)   8,000pten_StockIssuedOrVestedDuringPeriodSharesStockAwards
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Forfeitures of restricted stock (in shares)   (99,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Forfeitures of restricted stock   (1)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Exercise of stock options (in shares)   64,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Exercise of stock options 934us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 1us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
933us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Stock-based compensation 23,185us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   23,185us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Tax benefit (expense) related to stock-based compensation (1,284)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet   (1,284)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Payment of cash dividends (30,302)us-gaap_DividendsCommonStockCash     (30,302)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Purchase of treasury stock (170,292)us-gaap_TreasuryStockValueAcquiredCostMethod         (170,292)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2012 2,640,657us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,841us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
863,558us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2,548,542us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
21,767us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(795,051)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balance (in shares) at Dec. 31, 2012   184,060,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income 188,009us-gaap_ProfitLoss     188,009us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Foreign currency translation adjustment (7,691)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax       (7,691)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Issuance of restricted stock (in shares)   1,312,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of restricted stock   13us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(13)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Vesting of restricted stock units (in shares)   9,000pten_StockIssuedOrVestedDuringPeriodSharesStockAwards
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Forfeitures of restricted stock (in shares)   (84,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Forfeitures of restricted stock   (1)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Exercise of stock options (in shares)   1,190,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Exercise of stock options 19,286us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 12us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
19,274us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Stock-based compensation 25,891us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   25,891us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Tax benefit (expense) related to stock-based compensation 4,794us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet   4,794us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Payment of cash dividends (29,112)us-gaap_DividendsCommonStockCash     (29,112)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Purchase of treasury stock (85,837)us-gaap_TreasuryStockValueAcquiredCostMethod         (85,837)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2013 2,755,997us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,865us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
913,505us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2,707,439us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
14,076us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(880,888)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balance (in shares) at Dec. 31, 2013 186,487,246us-gaap_CommonStockSharesIssued 186,487,246us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income 162,664us-gaap_ProfitLoss     162,664us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Foreign currency translation adjustment (7,613)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax       (7,613)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Issuance of restricted stock (in shares)   1,102,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of restricted stock   11us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(11)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Vesting of restricted stock units (in shares)   10,000pten_StockIssuedOrVestedDuringPeriodSharesStockAwards
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Vesting of restricted stock units 1pten_StockIssuedOrVestedDuringPeriodValueStockAwards 1pten_StockIssuedOrVestedDuringPeriodValueStockAwards
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Forfeitures of restricted stock (in shares)   (61,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Forfeitures of restricted stock   (1)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Exercise of stock options (in shares) 1,725,195us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 1,725,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Exercise of stock options 35,435us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 17us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
35,418us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Stock-based compensation 27,032us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   27,032us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Tax benefit (expense) related to stock-based compensation 8,729us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet   8,729us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Payment of cash dividends (58,288)us-gaap_DividendsCommonStockCash     (58,288)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Purchase of treasury stock (18,147)us-gaap_TreasuryStockValueAcquiredCostMethod         (18,147)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2014 $ 2,905,810us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 1,893us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 984,674us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,811,815us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 6,463us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ (899,035)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balance (in shares) at Dec. 31, 2014 189,262,876us-gaap_CommonStockSharesIssued 189,262,876us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember