Shareholders' Equity (Details) - USD ($)			3 Months Ended
	Apr. 18, 2019	Feb. 01, 2019	Mar. 31, 2019	Dec. 31, 2018	Aug. 06, 2015
Class of Stock [Line Items]
Dividends paid (in dollars per share)			$ 0.25
Total dividends		$ 5,100,000
Common stock, outstanding (in shares)		20,381,859	20,167,729	20,163,816
Maximum investment under stock purchase and dividend reinvestment plan			$ 120,000
Shares issued pursuant to exercise of stock options (in shares)			29,600
Stock issued, increase in shareholders' equity			$ 540,000
The 2015 Program
Class of Stock [Line Items]
Stock repurchase program, number of shares authorized to be repurchased					1,200,000
Shares repurchased during period			12,702
Shares remaining authorized for repurchase			$ 27,314
RSU's and PSU's
Class of Stock [Line Items]
Share based compensation expense			$ 1,100,000
Maximum
Class of Stock [Line Items]
Shelf registration, shares registered			1,500,000
Maximum | The 2015 Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 40,000,000
Subsequent Event
Class of Stock [Line Items]
Dividends declared per share (in dollars per share)	$ 0.25
Stock repurchase program, number of shares authorized to be repurchased	1,000,000
Stock repurchase program, authorized amount	$ 45,000,000