Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) plan $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive plans \| plan	2
Granted (in shares) \| shares	189,170
Grants (in dollars per share) \| $ / shares	$ 15.95
Weighted average remaining contractual term	7 years 8 months 18 days
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares	750,000
Shares reserved for future issuance (in shares) \| shares	723,479
Discount from market price, offering date	15.00%
Maximum percentage of employee compensation for purchase of common stock	10.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares	189,170	176,940	129,400
Grants (in dollars per share) \| $ / shares	$ 15.95	$ 12.87	$ 11.88
Expiration period from date of grant	10 years
Aggregate intrinsic value of stock options exercised	$ 1.8	$ 1.3	$ 2.5
Cash received from the exercise of options	2.6	1.8	4.3
Tax benefits realized for the tax deductions from options exercised	$ 0.6	0.3	0.9
Options vested (in shares) \| shares	446,818
Weighted average exercise price (in dollars per share) \| $ / shares	$ 34.68
Aggregate intrinsic value	$ 7.3
Weighted average remaining contractual term	7 years 8 months 18 days
Share-based compensation expense	$ 1.6	0.9	0.7
Unrecognized compensation cost related to stock option	$ 3.7
Weighted average period	1 year 11 months 14 days
Total fair value of options expensed before tax benefits	$ 1.3	0.8	0.8
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Share-based compensation expense	$ 2.4	$ 2.1	$ 2.0
Weighted average period	1 year 4 months 24 days
Granted (in shares) \| shares	62,520	81,230	135,350
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 41.04	$ 32.36	$ 28.97
Compensation not yet recognized	$ 2.9
Fair value of awards vested in period	2.4	$ 2.7	$ 3.0
Tax benefit realized on vesting of options	0.6	0.6	1.1
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 3.2	$ 1.9	$ 2.0
Weighted average period	2 years 3 months 18 days
Granted (in shares) \| shares	58,178	64,700	126,000
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 43.80	$ 35.16	$ 26.31
Compensation not yet recognized	$ 3.2
Fair value of awards vested in period	3.8	$ 0.3	$ 1.2
Tax benefit realized on vesting of options	$ 0.9	$ 0.1	$ 0.5
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares	1,690,000
Shares reserved for future issuance other than stock options (in shares) \| shares	337,693
Shares reserved for future issuance (in shares) \| shares	222,132
Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	4 years
Third Anniversary \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.00%
Second Anniversary \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.00%
First Anniversary \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	34.00%

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