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Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Net income loss available to common stockholders |  |
Net income | $ 10,996 us-gaap_NetIncomeLoss | $ 4,537 us-gaap_NetIncomeLoss
Net income applicable to preferred stock | 1,077 us-gaap_PreferredStockDividendsAndOtherAdjustments | 452 us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income applicable to common stock | 9,919 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 4,085 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Determination of shares: |  |
Weighted-average common shares outstanding (in shares) | 79,400,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 77,917,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Assumed conversion of dilutive employee stock-based awards (in shares) | 2,296,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2,003,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Assumed conversion of restricted stock (in shares) | 72,000 penn_IncrementalCommonSharesAttributableToConversionOfRestrictedStock | 135,000 penn_IncrementalCommonSharesAttributableToConversionOfRestrictedStock
Diluted weighted-average common shares outstanding before participating security | 81,768,000 penn_WeightedAverageNumberOfDilutedSharesOutstandingBeforeParticipatingSecurity | 80,055,000 penn_WeightedAverageNumberOfDilutedSharesOutstandingBeforeParticipatingSecurity
Assumed conversion of preferred stock (in shares) | 8,624,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 8,624,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Diluted weighted-average common shares outstanding (in shares) | 90,392,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 88,679,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Anti-dilutive securities, options to purchase shares outstanding | 1,662,035 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 942,147 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Calculation of basic EPS: |  |
Net income applicable to common stock | 9,919 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 4,085 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding (in shares) | 79,400,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 77,917,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per common share (in dollars per share) | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic
Calculation of diluted EPS: |  |
Net income applicable to common stock | $ 9,919 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 4,085 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Diluted weighted-average common shares outstanding before participating security | 81,768,000 penn_WeightedAverageNumberOfDilutedSharesOutstandingBeforeParticipatingSecurity | 80,055,000 penn_WeightedAverageNumberOfDilutedSharesOutstandingBeforeParticipatingSecurity
Diluted earnings per common share (in dollars per share) | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted
Series C Preferred Stock |  |
Earnings Per Share |  |
Preferred stock , shares outstanding | 8,624 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 8,624 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember

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