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Subsequent Events (Details) - $ / shares
3 Months Ended
Apr. 24, 2018
Apr. 11, 2018
Mar. 31, 2018
Mar. 31, 2017
Apr. 30, 2018
Mar. 23, 2017
Subsequent Event [Line Items]            
Dividends declared per share (in US dollars per share)     $ 0.47 $ 0.47    
Subsequent Event            
Subsequent Event [Line Items]            
Dividends declared per share (in US dollars per share)   $ 0.47        
Stock options granted (in shares) 562,000          
Restricted Stock            
Subsequent Event [Line Items]            
Granted shares (in shares)     0      
Restricted Stock | Subsequent Event            
Subsequent Event [Line Items]            
Granted shares (in shares) 914,000          
Performance Based Restricted Stock | Subsequent Event            
Subsequent Event [Line Items]            
Granted shares (in shares) 352,500          
Vesting period 3 years          
Amended Credit Agreement | Term Loan | Line of Credit | London Interbank Offered Rate (LIBOR)            
Subsequent Event [Line Items]            
Basis spread on variable rate           2.25%
Amended Credit Agreement | Term Loan | Line of Credit | London Interbank Offered Rate (LIBOR) | Subsequent Event            
Subsequent Event [Line Items]            
Basis spread on variable rate         2.00%