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Debt (Details)
 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 28, 2019
USD ($)
Mar. 01, 2016
USD ($)
Line of Credit Facility [Line Items]      
Credit Spread Over London Interbank Offered Rate Basis Points 16250.00%    
Secured Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 500,000,000  
Line Of Credit Facility Additional Borrowing Capacity   $ 100,000,000 $ 400,000,000
Line of credit facility, covenant terms, maximum debt to EBITDA ratio 4.00    
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio 3.00    
Line Of Credit Facility, Covenant Terms, Maximum Aggregate Dividends $ 130,000,000    
Line of credit facility, covenant terms, percentage of shareholders' equity to net income 50.00%    
Credit Facility covenant leverage ratio three times limitation 3.00    
Credit Facility limitation on dividend payments at leverage ratio greater than 3.00x $ 5,000,000    
Credit Facility, covenants, 50% of net income limitation when leverage ratio exceeds 3.00x 50.00%    
Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member]      
Line of Credit Facility [Line Items]      
Credit Spread Over London Interbank Offered Rate Basis Points 2.00%    
Line of Credit Facility, Commitment Fee Percentage 0.40%    
Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member]      
Line of Credit Facility [Line Items]      
Credit Spread Over London Interbank Offered Rate Basis Points 1.875%    
Line of Credit Facility, Commitment Fee Percentage 0.35%    
Indebtedness To Adjusted Ebitda Ratio Greater Than Two But Less Than Or Equal To Three [Member]      
Line of Credit Facility [Line Items]      
Credit Spread Over London Interbank Offered Rate Basis Points 1.75%    
Line of Credit Facility, Commitment Fee Percentage 0.30%    
Indebtedness To Adjusted Ebitda Ratio Greater Than One But Less Than Or Equal To Two [Member]      
Line of Credit Facility [Line Items]      
Credit Spread Over London Interbank Offered Rate Basis Points 1.625%    
Line of Credit Facility, Commitment Fee Percentage 0.25%    
Indebtedness To Adjusted Ebitda Ratio Less Than Or Equal To One [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   1.0  
Credit Spread Over London Interbank Offered Rate Basis Points 1.50%    
Line of Credit Facility, Commitment Fee Percentage 0.20%    
Minimum | Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   3.5  
Minimum | Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   3  
Minimum | Indebtedness To Adjusted Ebitda Ratio Greater Than Two But Less Than Or Equal To Three [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   2.0  
Minimum | Indebtedness To Adjusted Ebitda Ratio Greater Than One But Less Than Or Equal To Two [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   1.0  
Maximum | Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   4  
Maximum | Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   3.5  
Maximum | Indebtedness To Adjusted Ebitda Ratio Greater Than Two But Less Than Or Equal To Three [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   3.0  
Maximum | Indebtedness To Adjusted Ebitda Ratio Greater Than One But Less Than Or Equal To Two [Member]      
Line of Credit Facility [Line Items]      
Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio   2.0