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Stock-Based Compensation Plans Nonvested (Details) - Restricted Stock/RSUs/PSUs(1)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Options  
Nonvested as of December 31, 2017 | shares 1,306,937
Granted | shares 536,172
Vested | shares (438,596)
Forfeited | shares (36,020)
Nonvested as of December 31, 2018 | shares 1,368,493
Weighted Average Grant Date Fair Value  
Nonvested as of December 31, 2013 (usd per share) | $ / shares $ 13.91
Granted (usd per share) | $ / shares 17.15
Vested (usd per share) | $ / shares 12.76
Forfeited (usd per share) | $ / shares 16.18
Nonvested as of December 31, 2014 (usd per share) | $ / shares $ 15.49