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Derivative Instruments and Hedging Activities - Offsetting Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Offsetting of Derivative Liabilities  
Gross Amounts of Recognized Liabilities $ (5,700)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
Gross Amounts Offset in the Statement of Financial Position (201)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
Net Amounts of Liabilities Presented in the Statement of Financial Position (5,901)prx_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral
Financial Instruments 201us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
Cash Collateral Pledged 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
Net Amount (5,700)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
Counterparty 1 [Member]  
Offsetting of Derivative Liabilities  
Gross Amounts of Recognized Liabilities (3,820)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyOneMember
Gross Amounts Offset in the Statement of Financial Position (143)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyOneMember
Net Amounts of Liabilities Presented in the Statement of Financial Position (3,963)prx_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyOneMember
Financial Instruments 143us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyOneMember
Cash Collateral Pledged 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyOneMember
Net Amount (3,820)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyOneMember
Counterparty 2 [Member]  
Offsetting of Derivative Liabilities  
Gross Amounts of Recognized Liabilities (1,880)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyTwoMember
Gross Amounts Offset in the Statement of Financial Position (58)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyTwoMember
Net Amounts of Liabilities Presented in the Statement of Financial Position (1,938)prx_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyTwoMember
Financial Instruments 58us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyTwoMember
Cash Collateral Pledged 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyTwoMember
Net Amount $ (1,880)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= prx_CounterpartyTwoMember