CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Deferred Compensation [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Total
BALANCE at Dec. 31, 2008	$ 120,597	$ 15,119	$ (3,619)	$ (6,584)	$ 55,219	$ (5,783)	$ 174,949
BALANCE (in shares) at Dec. 31, 2008	26,088,261
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	0	0	49,239	0	49,239
Employee pension plan adjustments, net of taxes	0	0	0	0	0	882	882
Stock-based compensation expense
Restricted stock	0	410	798	0	0	0	1,208
Restricted stock (in shares)	144,288
Stock options	0	1,169	0	0	0	0	1,169
Purchase of treasury stock	0	0	0	(26,187)	0	0	(26,187)
Sale of common stock,net of expenses	14,932	0	0	0	0	0	14,932
Sale of common stock,net of expenses (in shares)	1,150,000
Tax benefit of options exercised	0	578	0	0	0	0	578
Net share settlement for equity-based compensation	0	(294)	0	0	0	0	(294)
Net share settlement for equity-based compensation (in shares)	(16,206)
Other	0	(2,821)	2,821	0	0	0	0
Exercise of stock options	2,160	0	0	0	0	0	2,160
Exercise of stock options (in shares)	356,128
Tax benefit of option exercised	0	578	0	0	0	0	578
BALANCE at Dec. 31, 2009	137,689	14,161	0	(32,771)	104,458	(4,901)	218,636
BALANCE (in shares) at Dec. 31, 2009	27,722,471
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	0	0	69,731	0	69,731
Employee pension plan adjustments, net of taxes	0	0	0	0	0	153	153
Stock-based compensation expense
Restricted stock	0	2,036	0	0	0	0	2,036
Restricted stock (in shares)	17,624
Stock options	0	629	0	0	0	0	629
Purchase of treasury stock	0	0	0	(50,089)	0	0	(50,089)
Tax benefit of options exercised	0	1,484	0	0	0	0	1,484
Net share settlement for equity-based compensation	(112)	(932)	0	0	0	0	(1,044)
Net share settlement for equity-based compensation (in shares)	(52,214)
Cash dividend	0	0	0	0	(22,000)	0	(22,000)
Exercise of stock options	3,149	0	0	0	0	0	3,149
Exercise of stock options (in shares)	422,106
Tax benefit of option exercised	0	1,484	0	0	0	0	1,484
BALANCE at Dec. 31, 2010	140,726	17,378	0	(82,860)	151,989	(4,748)	222,485
BALANCE (in shares) at Dec. 31, 2010	28,109,987						28,109,987
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	0	0	17,540	0	17,540
Employee pension plan adjustments, net of taxes	0	0	0	0	0	(1,968)	(1,968)
Stock-based compensation expense
Restricted stock	0	3,141	0	0	0	0	3,141
Restricted stock (in shares)	393,431
Stock options	0	400	0	0	0	0	400
Tax benefit of options exercised	0	158	0	0	0	0	158
Tax deficiency of stock-based awards and canceled	0	(740)	0	0	0	0	(740)
Net share settlement for equity-based compensation	(60)	(802)	0	0	0	0	(862)
Net share settlement for equity-based compensation (in shares)	(68,250)
Cash dividend	0	0	0	0	(1,583)	0	(1,583)
Cash dividend declared true-up	0	0	0	0	(257)	0	(257)
Exercise of stock options	711	0	0	0	0	0	711
Exercise of stock options (in shares)	113,106
Tax benefit of option exercised	0	158	0	0	0	0	158
BALANCE at Dec. 31, 2011	$ 141,377	$ 19,535	$ 0	$ (82,860)	$ 167,689	$ (6,716)	$ 239,025
BALANCE (in shares) at Dec. 31, 2011	28,548,274						28,548,274