Equity Compensation Plans - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Apr. 27, 2012	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 0.5	$ 1.4	$ 1.5	$ 2.6
Stock options granted (shares)			0	0	11,180
Stock options exercised (shares)			0	3,325	27,041
Cash received from exercise of stock option				$ 0.0	$ 0.7
Intrinsic value of options exercised				0.1	0.7
Intrinsic value of stock options exercised, tax benefit				$ 0.1	$ 0.1
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, term				10 years
Total unrecognized compensation cost		3.0		$ 3.0
Weighted average expected amortization period				2 years 8 months 12 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		$ 3.9		$ 3.9
Weighted average expected amortization period				1 year 10 months 24 days
Unvested restricted stock awards (shares)		265,816		265,816
Time Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (shares)		0	0	33,932	8,106
Restricted shares vested (shares)		0	0	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	0	0	15,190
Restricted shares vested (shares)		0	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