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Retirement Plans - Schedule of Plan Assets Fair Value Hierarchy (Details) - United Kingdom Subsidiary - UK Plan - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 307,001 $ 264,194 $ 295,968
Corporate debt funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 64,314 37,703  
Corporate debt funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Corporate debt funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 64,314 37,703  
Corporate debt funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Government bond funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49,164 52,445  
Government bond funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Government bond funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49,164 52,445  
Government bond funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 32,356 35,425  
Equity funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 32,356 35,425  
Equity funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 32,240 16,097  
Cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 32,240 16,097  
Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Total plan assets in fair value hierarchy      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 178,074 141,670  
Total plan assets in fair value hierarchy | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 32,240 16,097  
Total plan assets in fair value hierarchy | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 145,834 125,573  
Total plan assets in fair value hierarchy | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Debt funds | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 103,188 98,077  
Real estate funds | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] $ 25,739 $ 24,447  
[1]
Certain investments measured using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets.