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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at December 31 (in shares) 4,046 3,554 3,921
Granted (in shares) 975 779 227
Exercised (in shares) (405) (162) (415)
Forfeitures (in shares) (556) (125) (179)
Outstanding at December 31 (in shares) 4,060 4,046 3,554
Options vested (in shares) 2,467 2,703 2,600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Outstanding at December 31 (in USD per share) $ 8.35 $ 8.52 $ 5.07
Granted (in USD per share) 6.87 7.23 14.60
Exercised (in USD per share) 2.95 4.82 4.83
Forfeited (in USD per share) 9.58 4.11 8.97
Outstanding at December 31 (in USD per share) 8.37 $ 8.35 $ 8.52
Options vested (in USD per share) $ 8.80    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Outstanding at December 31 $ 4,725 $ 4,779 $ 28,048
Granted 0 0 0
Exercised 1,604 3,302 3,190
Forfeited 0 0 0
Outstanding at December 31 2,760 $ 4,725 $ 4,779
Options vested $ 2,026