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Stock-Based Compensation Plans - Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at December 31 (in shares) 4,434 4,761 4,060
Granted (in shares) 912 568 1,348
Exercised (in shares) (662) (428) (420)
Forfeitures (in shares) (573) (467) (227)
Outstanding at December 31 (in shares) 4,111 4,434 4,761
Options vested (in shares) 2,030 2,500 2,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Outstanding at December 31 (in USD per share) $ 8.57 $ 8.40 $ 8.37
Granted (in USD per share) 8.20 10.73 8.15
Exercised (in USD per share) 5.33 7.85 6.27
Forfeited (in USD per share) 11.21 10.39 10.20
Outstanding at December 31 (in USD per share) 8.53 $ 8.57 $ 8.40
Options vested (in USD per share) $ 8.68    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Outstanding at December 31 $ 9,340 $ 8,655 $ 2,760
Granted 0 0 0
Exercised 967 1,300 4,455
Forfeited 0 539 0
Outstanding at December 31 37 $ 9,340 $ 8,655
Options vested $ 37