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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) false 4 Granted, weighted average exercise price per share 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice us-gaap true na instant No definition available. false false false false false false false false false false false terselabel true 1 true true false false 30.72 30.72 false false false 2 true true false false 31 31 false false false 3 false false false false 0 0 false false false us-types:perShareItemType decimal The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) false 5 Exercised 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod us-gaap true na duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false true false false -289000 -289 false false false 3 false false false false 0 0 false false false xbrli:sharesItemType shares The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(e) false 7 Forfeited or expired 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod us-gaap true na duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false true false false -518000 -518 false false false 3 false false false false 0 0 false false false xbrli:sharesItemType shares For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. No authoritative reference available. false 8 Forfeited or expired, weighted average exercise price per share 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice us-gaap true na duration No definition available. false false false false false false false false false false false terselabel true 1 false false false false 0 0 false false false 2 true true false false 39 39 false false false 3 false false false false 0 0 false false false us-types:perShareItemType decimal For presentations that combine terminations, the weighted average price of expired options and the price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period . No authoritative reference available. false 9 Options Outstanding, shares 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 15443000 15443 false false false 3 false true false false 13561000 13561 false false false xbrli:sharesItemType shares The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options. 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