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Stock-Based Compensation Plans Nonvested (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Nonvested Stock Options  
Options  
Nonvested as of December 31, 2016 | shares 82,447
Granted | shares 0
Vested | shares (81,847)
Forfeited | shares (600)
Nonvested as of December 31, 2017 | shares 0
Weighted Average Grant Date Fair Value  
Nonvested as of December 31, 2013 (usd per share) | $ / shares $ 3.14
Granted (usd per share) | $ / shares 0.00
Vested (usd per share) | $ / shares 3.14
Forfeited (usd per share) | $ / shares 3.14
Nonvested as of December 31, 2014 (usd per share) | $ / shares $ 0.00
Restricted Stock/RSUs/PSUs  
Options  
Nonvested as of December 31, 2016 | shares 1,525,715
Granted | shares 501,664
Vested | shares (603,308)
Forfeited | shares (117,134)
Nonvested as of December 31, 2017 | shares 1,306,937
Weighted Average Grant Date Fair Value  
Nonvested as of December 31, 2013 (usd per share) | $ / shares $ 12.74
Granted (usd per share) | $ / shares 15.85
Vested (usd per share) | $ / shares 12.51
Forfeited (usd per share) | $ / shares 14.15
Nonvested as of December 31, 2014 (usd per share) | $ / shares $ 13.91