XML 90 R77.htm IDEA: XBRL DOCUMENT v3.19.1
Benefit Plans - Deferred Compensation Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
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   4.50%   3.75%
Deferred compensation obligation $ 3.8   $ 3.4  
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%