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Employee Benefit Plans and Employment Agreements Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
plan
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Number of defined benefit plans 3pnx_DefinedBenefitPlanNumberOfPlans    
Number of plans 2pnx_DefinedBenefitPlansNumberofPlans    
Threshold for coverage 65 years    
Employee benefit expense $ 3.8us-gaap_EmployeeBenefitsAndShareBasedCompensation $ 3.2us-gaap_EmployeeBenefitsAndShareBasedCompensation $ 4.6us-gaap_EmployeeBenefitsAndShareBasedCompensation
Expected contributions over the next 12 months $ 0us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear