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Related Party Transactions - Transactions with Related Individuals (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Father of Management        
Related Party Transaction [Line Items]        
Paid to individual $ 0.2 $ 0.2 $ 0.2 $ 0.2