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Debt Private Placement Shelf Agreement (Details) - Maximum - Senior Notes - USD ($)
$ in Thousands
Sep. 22, 2016
Sep. 22, 2014
Prudential Private Placement Shelf Agreement    
Debt Instrument [Line Items]    
Agreement face amount   $ 100,000
Debt Instrument, Term   12 years
MetLife Private Placement Shelf Agreement    
Debt Instrument [Line Items]    
Agreement face amount $ 100,000  
Debt Instrument, Term 12 years