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Debt (Schedule of Long-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term Debt $ 455,080us-gaap_LongTermDebt $ 502,513us-gaap_LongTermDebt
Long-term Debt, Current Maturities (27)us-gaap_LongTermDebtCurrent (2,847)us-gaap_LongTermDebtCurrent
Long-term Debt, Excluding Current Maturities 455,053us-gaap_LongTermDebtNoncurrent 499,666us-gaap_LongTermDebtNoncurrent
Other Debt Obligations [Member]    
Debt Instrument [Line Items]    
Long-term Debt 80us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_OtherDebtSecuritiesMember		 2,927us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_OtherDebtSecuritiesMember
Senior Notes [Member] | Senior Notes, Issued [Member]    
Debt Instrument [Line Items]    
Long-term Debt 300,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= pes_SeniorNotesIssuedMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 419,586us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= pes_SeniorNotesIssuedMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Revolving Credit Facility [Member] | Senior secured revolving credit facility [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 155,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 $ 80,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember