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Convertible Preferred Stock (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Rate
Dec. 31, 2014
Convertible Preferred Stock (Textual) [Abstract]    
Preferred stock, shares outstanding 1,495,000us-gaap_PreferredStockSharesOutstanding 1,495,000us-gaap_PreferredStockSharesOutstanding
Series B cumulative convertible perpetual preferred stock interest rate 6.875%us-gaap_PreferredStockDividendRatePercentage  
Terms of applicable conversion terms if the closing sale price of the Company’s common stock for 20 trading days within a period of 30 consecutive trading days ending on the trading day immediately preceding the date the Company gives the conversion notice equals or exceeds 130% of the conversion price in effect on each such trading day. Each share of Series B Preferred Stock may be converted at any time, at the option of the holder, into 3.4433 shares of the Company’s common stock (which is based on an initial conversion price of approximately $14.52 per share of common stock, subject to adjustment) plus cash in lieu of fractional shares, subject to the Company’s right to settle all or a portion of any such conversion in cash or shares of the Company’s common stock. If the Company elects to settle all or any portion of its conversion obligation in cash, the conversion value and the number of shares of the Company’s common stock it will deliver upon conversion (if any) will be based upon a 20 trading day averaging period.  
Number of trading days 20 days  
Number of consecutive trading days 30 days  
Closing price as percentage of conversion price 130.00%pq_ClosingPriceAsPercentageOfConversionPrice  
Series B Preferred Stock converted into common stock (in shares) 3.4433us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion  
Initial conversion price of common stock (in usd per share) $ 14.52pq_ConvertiblePreferredStockInitialConversionPriceOfCommonStock  
Applicable settlement terms If the Company elects to settle all or any portion of its conversion obligation in cash, the conversion value and the number of shares of the Company’s common stock it will deliver upon conversion (if any) will be based upon a 20 trading day averaging period.  
Trading day averaging period for determining conversion value 20 days  
Conversion rate numerator for Preferred Stock $ 50pq_ConversionRateNumeratorForPreferredStock