Equity Compensation Plans - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Apr. 27, 2012	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 0.6	$ 0.6	$ 2.1	$ 3.2
Stock options granted (shares)		108,380	0	108,380	11,180
Stock options exercised (shares)		1,000	19,250	4,325	46,291
Cash received from exercise of stock option		$ 0.1	$ 0.2	$ 0.1	$ 0.8
Intrinsic value of options exercised		0.1	0.6	0.1	1.3
Intrinsic value of stock options exercised, tax benefit		0.1	$ 0.1	$ 0.1	$ 0.3
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, term				10 years
Total unrecognized compensation cost		3.2		$ 3.2
Weighted average expected amortization period				2 years 9 months 18 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		$ 3.3		$ 3.3
Weighted average expected amortization period				1 year 9 months 18 days
Unvested restricted stock awards (shares)		244,196		244,196
Time Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (shares)		7,480	10,790	41,412	18,896
Restricted shares vested (shares)		1,230	14,570	6,698	19,734
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