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Stock-Based Compensation (Restricted Stock) (Details)
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Restricted stock, beginning of period (in shares) | shares 275,191
Restricted stock, granted (in shares) | shares 91,448
Restricted stock, released (in shares) | shares (65,704)
Restricted stock, forfeited (in shares) | shares (23,666)
Restricted stock, end of period (in shares) | shares 277,269
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted average grant date fair value, beginning balance (per share) | $ / shares $ 65.81
Weighted average grant date fair value, granted (per share) | $ / shares 68.96
Weighted average grant date fair value, released (per share) | $ / shares 81.68
Weighted average grant date fair value, forfeited (per share) | $ / shares 61.09
Weighted average grant date fair value, ending balance (per share) | $ / shares $ 63.61
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Restricted stock, beginning of period (in shares) | shares 303,348
Restricted stock, granted (in shares) | shares 55,584
Restricted stock, released (in shares) | shares (15,737)
Restricted stock, forfeited (in shares) | shares (71)
Restricted stock, end of period (in shares) | shares 343,124
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted average grant date fair value, beginning balance (per share) | $ / shares $ 28.39
Weighted average grant date fair value, granted (per share) | $ / shares 48.12
Weighted average grant date fair value, released (per share) | $ / shares 98.54
Weighted average grant date fair value, forfeited (per share) | $ / shares 53.49
Weighted average grant date fair value, ending balance (per share) | $ / shares $ 27.70