Equity Compensation Plans - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 27, 2012	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 1.0	$ 1.2
Stock options granted (shares)		0	11,180
Stock options exercised (shares)		0	27,041
Cash received from exercise of stock option			$ 0.7
Intrinsic value of options exercised			0.6
Intrinsic value of stock options exercised, tax benefit			$ 0.1
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, term		10 years
Total unrecognized compensation cost		$ 3.4
Weighted average expected amortization period		2 years 10 months 25 days
Employee Stock Option | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period		3 years
Employee Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period		4 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost		$ 5.2
Weighted average expected amortization period		2 years 1 month
Unvested restricted stock awards (shares)		272,816
Time Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (shares)		33,932	8,106
Restricted shares vested (shares)		5,468	5,164
Time Based Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period		2 years
Time Based Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period		4 years
Performance Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (shares)		0	15,190
Restricted shares vested (shares)		0	48,035
Stock Option Plan 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share options and restricted shares authorized (shares)	1,750,000
Additional shares authorized under the plan (shares)	1,200,000