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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
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Number of Shares  
Outstanding at beginning of period (in shares) | shares 197
Granted (in shares) | shares 61
Vested (in shares) | shares (26)
Canceled (in shares) | shares (20)
Outstanding and unvested at end of period (in shares) | shares 212
Weighted-Average Grant Date Fair Value Per Share  
Outstanding and unvested (in dollars per share) | $ / shares $ 34.83
Granted (in dollars per share) | $ / shares 72.02
Vested (in dollars per share) | $ / shares 38.03
Canceled (in dollars per share) | $ / shares 34.37
Outstanding and unvested (in dollars per share) | $ / shares $ 45.18
Unrecognized compensation cost | $ $ 5.3
Weighted average period of compensation cost not yet recognized (in years) 1 year 4 months 6 days