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Summary of Significant Accounting Policies (Details 6) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income loss available to common stockholders |  |  |  |  |  |  |  |  |  |  |
Net income | $ (250,407,000)us-gaap_NetIncomeLoss | $ 8,499,000 us-gaap_NetIncomeLoss | $ 4,176,000 us-gaap_NetIncomeLoss | $ 4,537,000 us-gaap_NetIncomeLoss | $ (888,747,000)us-gaap_NetIncomeLoss | $ 41,317,000 us-gaap_NetIncomeLoss | $ (12,180,000)us-gaap_NetIncomeLoss | $ 65,271,000 us-gaap_NetIncomeLoss | $ (233,195,000)us-gaap_NetIncomeLoss | $ (794,339,000)us-gaap_NetIncomeLoss | $ 211,971,000 us-gaap_NetIncomeLoss
Net income applicable to preferred stock |  |  |  |  |  |  |  |  |  |  | 41,023,000 us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income applicable to common stock |  |  |  |  |  |  |  |  | (233,195,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (794,339,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 170,948,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Determination of shares: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 78,425,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,111,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 76,345,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Assumed conversion of dilutive employee stock-based awards (in shares) |  |  |  |  |  |  |  |  |  |  | 2,305,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Assumed conversion of restricted stock (in shares) |  |  |  |  |  |  |  |  |  |  | 159,000 penn_IncrementalCommonSharesAttributableToConversionOfRestrictedStock
Assumed conversion of preferred stock (in shares) |  |  |  |  |  |  |  |  |  |  | 24,995,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Diluted weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 103,804,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Anti-dilutive securities, options to purchase shares outstanding |  |  |  |  |  |  |  |  | 6,633,622 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 7,316,713 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 1,693,500 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Calculation of basic EPS: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income applicable to common stock |  |  |  |  |  |  |  |  | (233,195,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (794,339,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 170,948,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 78,425,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,111,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 76,345,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic (loss) earnings per common share | $ (3.18)us-gaap_EarningsPerShareBasic | $ 0.10 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ (11.40)us-gaap_EarningsPerShareBasic | $ 0.43 us-gaap_EarningsPerShareBasic | $ (0.16)us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ (2.97)us-gaap_EarningsPerShareBasic | $ (10.17)us-gaap_EarningsPerShareBasic | $ 2.24 us-gaap_EarningsPerShareBasic
Basic and Diluted EPS |  |  |  |  |  |  |  |  | $ (2.97)us-gaap_EarningsPerShareBasicAndDiluted | $ (10.17)us-gaap_EarningsPerShareBasicAndDiluted |
Calculation of diluted EPS using if-converted method: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (250,407,000)us-gaap_NetIncomeLoss | 8,499,000 us-gaap_NetIncomeLoss | 4,176,000 us-gaap_NetIncomeLoss | 4,537,000 us-gaap_NetIncomeLoss | (888,747,000)us-gaap_NetIncomeLoss | 41,317,000 us-gaap_NetIncomeLoss | (12,180,000)us-gaap_NetIncomeLoss | 65,271,000 us-gaap_NetIncomeLoss | (233,195,000)us-gaap_NetIncomeLoss | (794,339,000)us-gaap_NetIncomeLoss | 211,971,000 us-gaap_NetIncomeLoss
Diluted weighted-average common shares outstanding |  |  |  |  |  |  |  |  |  |  | 103,804,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted (loss) earnings per common share | $ (3.18)us-gaap_EarningsPerShareDiluted | $ 0.10 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ (11.40)us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted | $ (0.16)us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ (2.97)us-gaap_EarningsPerShareDiluted | $ (10.17)us-gaap_EarningsPerShareDiluted | $ 2.04 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 |  |  |  | 8,624 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 8,624 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |
Preferred stock , shares outstanding |  |  |  |  |  |  |  |  |  |  | 12,275 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series B Preferred Stock | Common stock price less than $45 |  |  |  |  |  |  |  |  |  |  |
Determination of shares: |  |  |  |  |  |  |  |  |  |  |
Common stock price (in dollars per share) | $ 45 us-gaap_SharePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceLessThan45DollarsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  | $ 45 us-gaap_SharePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceLessThan45DollarsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Increase in diluted weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 26,777,778 penn_WeightedAverageNumberOfDilutedSharesOutstandingIncrease / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceLessThan45DollarsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Series B Preferred Stock | Common stock price between $45 and $67 |  |  |  |  |  |  |  |  |  |  |
Determination of shares: |  |  |  |  |  |  |  |  |  |  |
Aggregate liquidation preference of preferred stock | $ 1,205,000,000 us-gaap_PreferredStockRedemptionAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  | $ 1,205,000,000 us-gaap_PreferredStockRedemptionAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Series B Preferred Stock | Common stock price between $45 and $67 | Minimum |  |  |  |  |  |  |  |  |  |  |
Determination of shares: |  |  |  |  |  |  |  |  |  |  |
Common stock price (in dollars per share) | $ 45 us-gaap_SharePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  | $ 45 us-gaap_SharePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Increase in diluted weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 17,985,075 penn_WeightedAverageNumberOfDilutedSharesOutstandingIncrease / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Series B Preferred Stock | Common stock price between $45 and $67 | Maximum |  |  |  |  |  |  |  |  |  |  |
Determination of shares: |  |  |  |  |  |  |  |  |  |  |
Common stock price (in dollars per share) | $ 67 us-gaap_SharePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  | $ 67 us-gaap_SharePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Increase in diluted weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 26,777,778 penn_WeightedAverageNumberOfDilutedSharesOutstandingIncrease / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Series B Preferred Stock | Common stock price more than $67 |  |  |  |  |  |  |  |  |  |  |
Determination of shares: |  |  |  |  |  |  |  |  |  |  |
Common stock price (in dollars per share) | $ 67 us-gaap_SharePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceMoreThan67DollarsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  | $ 67 us-gaap_SharePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceMoreThan67DollarsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Increase in diluted weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 17,985,075 penn_WeightedAverageNumberOfDilutedSharesOutstandingIncrease / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceMoreThan67DollarsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |

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