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Earnings per Share - Anti-Dilutive Securities (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total Securities (in shares) 10,754 7,961 11,969
Stock options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total Securities (in shares) 119 0 857
Restricted stock and performance shares [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total Securities (in shares) 5,242 2,568 5,719
Convertible preferred stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total Securities (in shares) 5,393 5,393 5,393