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Benefit Plans - Deferred Compensation Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Jan. 01, 2016
Jan. 01, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]          
Interest rate earned on deferred amounts, prime rate first business day of year   3.75%   3.50% 3.25%
Deferred compensation obligation $ 3.4   $ 3.2    
Annual Salary | Management          
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]          
Maximum percentage of compensation allowed to be deferred 80.00%        
Deferred Bonus | Management          
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]          
Maximum percentage of compensation allowed to be deferred 100.00%