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Stock-Based Compensation Plans Nonvested (Details) - Restricted Stock/RSUs/PSUs
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Options  
Nonvested as of December 31, 2018 | shares 1,368,493
Granted | shares 454,951
Vested | shares (407,872)
Forfeited | shares (43,236)
Nonvested as of December 31, 2019 | shares 1,372,336
Weighted Average Grant Date Fair Value  
Nonvested as of December 31, 2013 (usd per share) | $ / shares $ 15.49
Granted (usd per share) | $ / shares 15.51
Vested (usd per share) | $ / shares 12.38
Forfeited (usd per share) | $ / shares 16.61
Nonvested as of December 31, 2014 (usd per share) | $ / shares $ 16.39