Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 25, 2017	Dec. 31, 2017 USD ($) tranche $ / shares shares	Dec. 31, 2016 USD ($)
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Outstanding share awards earned and issued at greater than the target number of shares		200.00%
Restricted Stock | Minimum
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Vesting period (in years)		1 year
Restricted Stock | Maximum
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Vesting period (in years)		3 years
2016 Plan
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Aggregate number of shares that may be awarded (in shares)		646,000
Exercise period for shares awarded under plan	10 years
Number of tranches in award | tranche		2
Outstanding share awards that may be awarded (in shares)		302,000
Share-based compensation expense (benefit) | $		$ 194	$ 158
Total unrecognized compensation cost related to performance and restricted shares | $		$ 1,242
Period of recognized compensation cost (in years)		1 year 9 months
2016 Plan | Performance shares
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Performance period (in years)		3 years
Shares granted in period (in shares)		68,000
Shares forfeited in period (in shares)		5,000
2016 Plan | Performance shares | Minimum
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Common shares earned pursuant to award (in shares)		0
2016 Plan | Performance shares | Maximum
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Common shares earned as percentage of initial target number shares awarded		200.00%
2016 Plan | Performance and Restricted Shares
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Shares granted in period (in shares)		119,000
Shares granted in period, grant date fair value (in dollars per share) | $ / shares		$ 6.70
Vesting period (in years)		3 years
2016 Plan | Restricted Stock
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Shares granted in period (in shares)		51,000
Shares forfeited in period (in shares)		3,000