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Retirement Plans - Schedule of Plan Assets Fair Value Hierarchy (Details) - United Kingdom Subsidiary - UK Plan - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 257,236 $ 263,555 $ 282,095
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 435 897  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 256,801 262,658  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity and equity like investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 115,416 114,213  
Equity and equity like investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity and equity like investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 115,416 114,213  
Equity and equity like investments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 103,912 114,434  
Corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 103,912 114,434  
Corporate bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37,473 34,011  
Government bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37,473 34,011  
Government bonds | 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 435 897  
Cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 435 897  
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