Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - EPS and New Accounting Principle (Details)

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Summary of Significant Accounting Policies - EPS and New Accounting Principle (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings per share      
Basic weighted average number of shares outstanding 306,400 316,036 315,426
Diluted weighted average number of shares outstanding 306,400 316,036 316,283
Restricted stock and restricted stock unit      
Earnings per share      
Add: Dilutive effect of non-vested restricted stock units     817
Weighted Average Anti-dilutive Awards 2,357 2,844 1,521
Stock options      
Earnings per share      
Weighted Average Anti-dilutive Awards 527 626 676
Performance share unit awards      
Earnings per share      
Add: Dilutive effect of non-vested restricted stock units     40
Weighted Average Anti-dilutive Awards 1,443 1,705 1,054