CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock	Total
Balance at Dec. 31, 2013	$ 72,664	$ 29	$ 593,203	$ (225,722)	$ 4,456	$ (29,266)	$ 415,364
Increase (decrease) in shareholders' equity
Net income				25,181			25,181
Other comprehensive income					1,211		1,211
Issuance of treasury stock for employee stock purchase Plan			(376)			533	157
Net issuance of treasury stock for restricted stock unit vesting and related tax benefit			(229)			208	(21)
Cash dividends common stock at $0.42 and $0.45 per share for the period of Nine months ended September 2015 and 2014, respectively				(12,154)			(12,154)
Stock dividend equivalents restricted stock units at $0.42 and $0.45 per share for the period of Nine months ended September 2015 and 2014, respectively			146	(146)
Stock-based employee compensation			835				835
Preferred stock dividends				(545)			(545)
Balance at Sep. 30, 2014	72,664	29	593,579	(213,386)	5,667	(28,525)	430,028
Balance at Dec. 31, 2014	72,664	29	593,746	(210,384)	5,817	(28,233)	433,639
Increase (decrease) in shareholders' equity
Net income				28,323			28,323
Other comprehensive income					1,009		1,009
Issuance of treasury stock for employee stock purchase Plan			(495)			745	250
Net issuance of treasury stock for restricted stock unit vesting and related tax benefit			(3,784)			3,643	(141)
Issuance of treasury stock						34	34
Cash dividends common stock at $0.42 and $0.45 per share for the period of Nine months ended September 2015 and 2014, respectively				(13,041)			(13,041)
Stock dividend equivalents restricted stock units at $0.42 and $0.45 per share for the period of Nine months ended September 2015 and 2014, respectively			185	(185)
Stock-based employee compensation			1,001				1,001
Preferred stock dividends				(545)			(545)
Purchase of treasury stock						(6,296)	(6,296)
Cash payment for fractional shares related to reverse stock split			(5)				(5)
Balance at Sep. 30, 2015	$ 72,664	$ 29	$ 590,648	$ (195,832)	$ 6,826	$ (30,107)	$ 444,228