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Defined Contribution Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plan [Abstract]      
Required time period for employees for profit sharing plan 3 months    
Maximum employer contribution as a percentage of employee contribution 50.00%    
Contribution expense recognized $ 0.0 $ 0.0 $ 0.0
Employer matching contribution amount $ 1.1 $ 0.9 $ 0.7