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Summary of Significant Accounting Policies - EPS and New Accounting Principle (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings per share    
Basic weighted average number of shares outstanding 316,471 314,954
Diluted weighted average number of shares outstanding 316,911 315,769
U.S. Statutory federal income tax rate (as a percent) 21.00% 35.00%
Employee tax withholding for settlement of equity compensation awards $ (1,084) $ (1,657)
Restricted stock and restricted stock unit    
Earnings per share    
Add: Dilutive effect of non-vested restricted stock units 401 770
Weighted Average Anti-dilutive Awards 421 1,509
Stock options    
Earnings per share    
Weighted Average Anti-dilutive Awards 653 683
Performance share unit awards    
Earnings per share    
Add: Dilutive effect of non-vested restricted stock units 39 45
Weighted Average Anti-dilutive Awards 1,189 660