Dividends on Common Stock (Details) - USD ($)			6 Months Ended
	Jun. 25, 2019	Mar. 26, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 0.11	$ 0.11
Dividends on common stock	$ 1,865,000	$ 1,869,000	$ 1,869,000	$ 1,520,000
Authorized repurchase amount, common stock					$ 3,000,000