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Share-Based Compensation - Restricted Stock Awards and Restricted Stock Units (Details) - $ / shares
Aug. 02, 2018
Jun. 25, 2018
Feb. 21, 2018
Jan. 02, 2018
Aug. 02, 2017
Feb. 22, 2017
Jan. 03, 2017
Sep. 02, 2016
Aug. 03, 2016
Feb. 24, 2016
2014 Omnibus Share Incentive Plan (2014 Plan) | Performance Stock Units (PSUs)                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares awarded (shares)     85,000     100,000       140,000
Price per share (usd per share)     $ 46.35     $ 56.52       $ 38.99
2014 Omnibus Share Incentive Plan (2014 Plan) | Restricted Stock Units (RSUs)                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares awarded (shares)   2,000 125,000   48,700 50,000   50,000 226,500 50,000
Price per share (usd per share)   $ 44.78 $ 46.35   $ 49.75 $ 56.52   $ 58.94 $ 59.83 $ 38.99
Non Employee Directors Plan | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares awarded (shares) 1,687     21,304     14,294      
Price per share (usd per share) $ 49.38     $ 46.93     $ 61.21