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Credit Agreement (Details) - USD ($)
$ in Millions
Jul. 01, 2017
Dec. 31, 2016
Revolving credit facility    
Senior Loan Agreement    
Revolving credit facility, maximum capacity $ 125.0  
Amount of borrowings under revolving credit facility 0.0 $ 0.0
Amounts outstanding under letters of credit 2.8 $ 2.2
Letters of credit    
Senior Loan Agreement    
Revolving credit facility, maximum capacity $ 15.0