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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at December 31 (in shares) 4,761 4,060 4,046
Granted (in shares) 568 1,348 975
Exercised (in shares) (428) (420) (405)
Forfeitures (in shares) (467) (227) (556)
Outstanding at December 31 (in shares) 4,434 4,761 4,060
Options vested (in shares) 2,505 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) $ 8.40 $ 8.37 $ 8.35
Granted (in USD per share) 10.73 8.15 6.87
Exercised (in USD per share) 7.85 6.27 2.95
Forfeited (in USD per share) 10.39 10.20 9.58
Outstanding at December 31 (in USD per share) 8.57 $ 8.40 $ 8.37
Options vested (in USD per share) $ 8.62    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Outstanding at December 31 $ 8,655 $ 2,760 $ 4,725
Granted 0 0 0
Exercised 1,300 4,455 1,604
Forfeited 539 0 0
Outstanding at December 31 9,340 $ 8,655 $ 2,760
Options vested $ 5,860