XML 147 R131.htm IDEA: XBRL DOCUMENT v3.20.4
Retirement Plans - Measurement Date (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted-average assumptions used to determine net periodic pension cost        
Discount rate (as a percent)   4.10% 3.50%  
Defined Benefit Plan, Benefit Obligation $ 0 $ 0    
Non-contributory defined benefit pension plan        
Weighted-average assumptions used to determine net periodic pension cost        
Discount rate (as a percent)   4.10% 3.50%  
Expected long-term return on plan assets (as a percent)   7.75% 7.75%  
Defined Benefit Plan, Benefit Obligation     $ 28,906 $ 31,500
Number of shares repurchased 0 0 0