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Commitments and Contingencies (Details - Other Details) (USD $)
3 Months Ended 15 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2016
Other commitments [Line Items]      
Other expenses $ 124,750,000us-gaap_OtherExpenses $ 111,462,000us-gaap_OtherExpenses  
Termination Fee 250,000,000pre_TerminationFee    
Forecast [Member]      
Other commitments [Line Items]      
No Approval Fee     55,000,000pre_NoApprovalFee
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Termination Fee     280,000,000pre_TerminationFee
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Reimbursable Costs and Expenses     35,000,000pre_ReimbursableCostsAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Forecast [Member] | Minimum [Member]      
Other commitments [Line Items]      
Other expenses     30,000,000us-gaap_OtherExpenses
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Forecast [Member] | Maximum [Member]      
Other commitments [Line Items]      
Other expenses     $ 35,000,000us-gaap_OtherExpenses
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember