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Stock-Based Compensation (Restricted Stock) (Details)
3 Months Ended
Mar. 31, 2019
$ / 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 267,242
Restricted stock, granted (in shares) | shares 51,457
Restricted stock, released (in shares) | shares (48,022)
Restricted stock, forfeited (in shares) | shares (2,562)
Restricted stock, end of period (in shares) | shares 268,115
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 $ 63.97
Weighted average grant date fair value, granted (per share) | $ / shares 98.58
Weighted average grant date fair value, released (per share) | $ / shares 79.60
Weighted average grant date fair value, forfeited (per share) | $ / shares 48.22
Weighted average grant date fair value, ending balance (per share) | $ / shares $ 69.96
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 374,529
Restricted stock, granted (in shares) | shares 13,464
Restricted stock, released (in shares) | shares (12,293)
Restricted stock, forfeited (in shares) | shares 0
Restricted stock, end of period (in shares) | shares 375,700
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 $ 31.05
Weighted average grant date fair value, granted (per share) | $ / shares 98.97
Weighted average grant date fair value, released (per share) | $ / shares 90.34
Weighted average grant date fair value, forfeited (per share) | $ / shares 0.00
Weighted average grant date fair value, ending balance (per share) | $ / shares $ 30.95