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Employee Benefits and Share-Based Compensation - Performance Based Restricted Stock Unit Activity (Details) - 2009 Plan - Performance Shares
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Number of Shares  
Outstanding at beginning of period (in shares) | shares 225
Granted (in shares) | shares 110
Vested (in shares) | shares (67)
Canceled (in shares) | shares (32)
Outstanding and unvested at end of period (in shares) | shares 236
Weighted-Average Grant Date Fair Value Per Share  
Outstanding and unvested (in dollars per share) | $ / shares $ 31.18
Granted (in dollars per share) | $ / shares 38.03
Vested (in dollars per share) | $ / shares 30.46
Canceled (in dollars per share) | $ / shares 34.47
Outstanding and unvested (in dollars per share) | $ / shares $ 34.13
Unrecognized compensation cost | $ $ 3.4
Weighted average period of compensation cost not yet recognized (in years) 1 year 2 months 12 days