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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, 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 16        
Ending balance at Jun. 30, 2018 1,189   2,026 (714) (124)
Ending balance, shares at Jun. 30, 2018   108,391      
Ending balance, Common stock value at Jun. 30, 2018   $ 1      
Beginning balance at Mar. 31, 2018 1,192   2,023 (728) (104)
Beginning balance, shares at Mar. 31, 2018   108,141      
Beginning balance, Common stock value at Mar. 31, 2018   $ 1      
Net income 14     14  
Stock-based compensation 4   4    
Exercise of stock options, shares   3      
Vesting of restricted stock, shares   328      
Shares withheld for taxes (1)   (1)    
Shares withheld for taxes, shares   (81)      
Other comprehensive income (20)       (20)
Ending balance at Jun. 30, 2018 1,189   2,026 (714) (124)
Ending balance, shares at Jun. 30, 2018   108,391      
Ending balance, Common stock value at Jun. 30, 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      
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 32        
Other comprehensive income         11
Ending balance at Jun. 30, 2019 1,264   2,041 (646) (132)
Ending balance, shares at Jun. 30, 2019   108,796      
Ending balance, Common stock value at Jun. 30, 2019 1 $ 1      
Beginning balance at Mar. 31, 2019 1,245   2,037 (660) (133)
Beginning balance, shares at Mar. 31, 2019   108,709      
Beginning balance, Common stock value at Mar. 31, 2019   $ 1      
Net income 14     14  
Stock-based compensation 4   4    
Exercise of stock options, shares   20      
Vesting of restricted stock, shares   68      
Shares withheld for taxes, shares   (1)      
Other comprehensive income 1       1
Ending balance at Jun. 30, 2019 1,264   $ 2,041 $ (646) $ (132)
Ending balance, shares at Jun. 30, 2019   108,796      
Ending balance, Common stock value at Jun. 30, 2019 $ 1 $ 1