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Defined Benefit Plans - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
plan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Domestic      
Defined Benefit Plan Disclosure [Line Items]      
Estimated unrecognized loss that will be amortized from AOCI, net of income taxes $ 200    
Number of plans | plan 2    
Benefit obligation $ 7,000 $ 7,000  
Fair value of plan assets $ 5,000 $ 4,900  
Annual rate of return on plan assets 7.00% 7.00%  
Estimated future benefit payments $ 400    
Maximum | Domestic      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.00% 4.00%  
Minimum | Domestic      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.80% 3.80%  
United Kingdom Subsidiary | UK Plan      
Defined Benefit Plan Disclosure [Line Items]      
Underfunded status of UK Plan $ 49,495 $ 32,270  
Annual rate of inflation 2.20% 2.00%  
Average life expectancy 27 years    
Estimated unrecognized loss that will be amortized from AOCI, net of income taxes $ 2,200    
Future estimated employer contributions to be paid next year 4,400    
Benefit obligation 306,731 $ 295,825 $ 332,806
Fair value of plan assets $ 257,236 $ 263,555 $ 282,095
Discount rate 2.70% 3.80%  
Annual rate of return on plan assets 6.20% 6.30% 6.70%
Selling, General and Administrative Expenses | Domestic      
Defined Benefit Plan Disclosure [Line Items]      
Reclassification adjustment from AOCI, net of income taxes $ 200 $ 200 $ 200
Selling, General and Administrative Expenses | United Kingdom Subsidiary | UK Plan      
Defined Benefit Plan Disclosure [Line Items]      
Reclassification adjustment from AOCI, net of income taxes 1,700 2,000 $ 1,600
Other Noncurrent Liabilities | United Kingdom Subsidiary | UK Plan      
Defined Benefit Plan Disclosure [Line Items]      
Underfunded status of UK Plan $ 49,495 $ 32,270