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