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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings (Deficit) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017 $ 1,185   $ 2,019 $ (730) $ (105)
Beginning balance, shares at Dec. 31, 2017   108,030      
Beginning balance, Common stock value at Dec. 31, 2017   $ 1      
Net income 2     2  
Stock-based compensation 4   4    
Vesting of restricted stock, shares   158      
Shares withheld for taxes, shares   (47)      
Other comprehensive income 1       1
Ending balance at Mar. 31, 2018 1,192   2,023 (728) (104)
Ending balance, shares at Mar. 31, 2018   108,141      
Ending balance, Common stock value at Mar. 31, 2018   $ 1      
Beginning balance at Dec. 31, 2018 1,214   2,034 (678) (143)
Beginning balance, shares at Dec. 31, 2018   108,427      
Beginning balance, Common stock value at Dec. 31, 2018 1 $ 1      
Net income 18     18  
Stock-based compensation 4   4    
Exercise of stock options 1   1    
Exercise of stock options, shares   70      
Vesting of restricted stock, shares   305      
Shares withheld for taxes (2)   (2)    
Shares withheld for taxes, shares   (93)      
Other comprehensive income 10       10
Ending balance at Mar. 31, 2019 1,245   $ 2,037 $ (660) $ (133)
Ending balance, shares at Mar. 31, 2019   108,709      
Ending balance, Common stock value at Mar. 31, 2019 $ 1 $ 1