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Summary of Significant Accounting Policies - EPS and New Accounting Principle (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings per share        
Basic weighted average number of shares outstanding   316,036 315,426 294,945
Diluted weighted average number of shares outstanding   316,036 316,283 294,945
U.S. Statutory federal income tax rate (as a percent) 21.00% 21.00% 35.00% 35.00%
Benefit recognized from reduction in deferred tax liabilities due to a change in state tax laws     $ 427,962  
Employee tax withholding for settlement of equity compensation awards   $ (17,020) $ (24,174) $ (26,895)
Restricted stock and restricted stock unit        
Earnings per share        
Add: Dilutive effect of non-vested restricted stock units     817  
Weighted Average Anti-dilutive Awards   2,844 1,521 6,740
Stock options        
Earnings per share        
Weighted Average Anti-dilutive Awards   626 676 702
Performance share unit awards        
Earnings per share        
Add: Dilutive effect of non-vested restricted stock units     40  
Weighted Average Anti-dilutive Awards   1,705 1,054 659