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Retirement Plans - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Plans      
Noncontributory benefit pension plans covering active employees 3.00%    
Defined Benefit Plan, Plan Assets, Payment for Settlement     $ 23,912
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement     23,912
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax     13,476
Amortization period 17 years    
Amortization of retirement benefits, net of tax $ 6,429    
Post-Retirement Life Insurance Plan      
Retirement Plans      
Amortization period 4 years    
UNITED STATES      
Retirement Plans      
Settlement loss $ 0 $ 0 13,476
Expected contribution to be made by CTS 493    
Foreign Plan      
Retirement Plans      
Settlement loss 0 $ 0 $ 0
Expected contribution to be made by CTS $ 261