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Earnings per Share - Summary of Basic and Diluted Weighted Average Shares Outstanding (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Weighted average basic shares outstanding 129,562 129,225 129,434 130,237
Effect of dilutive securities:        
Unvested share units and shares held by employees (in shares) 230 183 212 168
Stock options held by employees and directors (in shares) 349 460 325 493
Diluted weighted average shares outstanding (in shares) 130,141 129,868 129,971 130,898
Anti-dilutive share awards (in shares) 881 727 1,296 532