Shareholders' Equity and Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
		Nov. 15, 2011	Mar. 31, 2016	Mar. 31, 2015	Apr. 26, 2016	Jan. 21, 2016
Class of Stock [Line Items]
Stock repurchased			$ 15,510	$ 902
Shareholders with certain limited exceptions		5.00%
Number of Series C Junior participating preferred stock purchase by each right		1/1000
Beneficial ownership level		4.99%
Discount to current market price of the common stock		50.00%
Earnings Per Share Reconciliation [Abstract]
Net income			$ 4,100	$ 3,781
Weighted average shares outstanding (in shares)	[1]		21,751,000	22,997,000
Stock units for deferred compensation plan for non-employee directors (in shares)			113,000	111,000
Effect of stock options (in shares)			112,000	121,000
Restricted stock units (in shares)			86,000	309,000
Weighted average shares outstanding for calculation of diluted earnings per share (in shares)			22,062,000	23,538,000
Net income per common share [Abstract]
Basic (in dollars per share)	[1]		$ 0.19	$ 0.16
Diluted (in dollars per share)			$ 0.19	$ 0.16
Common Stock [Member]
Class of Stock [Line Items]
Stock repurchase program percentage of shares authorized to be repurchased						5.00%
Stock repurchased (in shares)			1,059,865
Stock repurchased			$ 15,500
Stock repurchase program, remaining shares to be repurchased (in shares)			52,703
Common Stock [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Stock repurchase program, additional authorized amount					$ 5,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of diluted loss per share (in shares)			30,000	30,000

[1] Basic net income per common share includes weighted average common shares outstanding during the period and participating share awards.