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Related Party Transactions Related Party Transactions (Debt Agreements) (Details) - Affiliated Entity - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Short-term and Long-term debt $ 1,727 $ 0
Prudential Funding, LLC    
Related Party Transaction [Line Items]    
Short-term and Long-term debt $ 1,727 $ 0
Interest Rates 2.04%