Restricted Stock Plan (Details) - Restricted stock plan - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock options
Shares reserved for issuance thereunder	405,805.00		405,805.00
Weighted Average Grant Date Fair Value
Stock based compensation expense, before tax	$ 5,500	$ 9,900	$ 11,000	$ 16,200
Stock based compensation expense, net of tax	4,000	$ 7,300	8,000	$ 11,900
Total unrecognized compensation cost related to non-vested restricted stock units	$ 37,000		$ 37,000
Weighted-average period over which unrecognized compensation cost will be recognized			2 years
Employees
Shares
Non-vested balance at beginning of period (in shares)			9,000
Vested (in shares)			(3,000)
Non-vested balance at end of period (in shares)	6,000		6,000
Weighted Average Grant Date Fair Value
Non-vested balance at beginning of period (in dollars per share)			$ 7.30
Vested (in dollars per share)			7.30
Non-vested balance at end of period (in dollars per share)	$ 7.30		$ 7.30