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Employee Benefits (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
plan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
General Discussion of Pension and Other Postretirement Benefits [Abstract]      
Total expense under employee benefit plans $ 2.5 $ 2.4 $ 2.1
Company matching contributions (approximately) $ 0.3 0.3 $ 0.3
Number of defined benefit plans | plan 4    
Liability under the defined benefit plans $ 6.7 $ 6.6