CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Total
BALANCE at Dec. 31, 2009	$ 137,689	$ 14,161	$ (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	69,731	0	69,731
Employee pension plan adjustments, net of taxes	0	0	0	0	153	153
Stock-based compensation expense
Restricted stock	0	2,036	0	0	0	2,036
Restricted stock (in shares)	17,624
Stock options	0	629	0	0	0	629
Purchase of treasury stock	0	0	(50,089)	0	0	(50,089)
Tax benefit of options exercised	0	1,484	0	0	0	1,484
Net share settlement for equity-based compensation	(112)	(932)	0	0	0	(1,044)
Net share settlement for equity-based compensation (in shares)	(52,214)
Cash dividend	0	0	0	(22,200)	0	(22,200)
Exercise of stock options	3,149	0	0	0	0	3,149
Exercise of stock options (in shares)	422,106					422,106
BALANCE at Dec. 31, 2010	140,726	17,378	(82,860)	151,989	(4,748)	222,485
BALANCE (in shares) at Dec. 31, 2010	28,109,987
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	0	17,540	0	17,540
Employee pension plan adjustments, net of taxes	0	0	0	0	(1,968)	(1,968)
Stock-based compensation expense
Restricted stock	0	3,141	0	0	0	3,141
Restricted stock (in shares)	393,431
Stock options	0	400	0	0	0	400
Tax benefit of options exercised	0	158	0	0	0	158
Tax deficiency of stock-based awards and canceled	0	(740)	0	0	0	(740)
Net share settlement for equity-based compensation	(60)	(802)	0	0	0	(862)
Net share settlement for equity-based compensation (in shares)	(68,250)
Cash dividend	0	0	0	(1,583)	0	(1,583)
Cash dividend declared true-up	0	0	0	(257)	0	(257)
Exercise of stock options	711	0	0	0	0	711
Exercise of stock options (in shares)	113,106					113,106
BALANCE at Dec. 31, 2011	141,377	19,535	(82,860)	167,689	(6,716)	239,025
BALANCE (in shares) at Dec. 31, 2011	28,548,274					28,548,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	0	(37,186)	0	(37,186)
Employee pension plan adjustments, net of taxes	0	0	0	0	(60)	(60)
Stock-based compensation expense
Restricted stock	0	3,982	0	0	0	3,982
Restricted stock (in shares)	1,213,621
Stock options	0	358	0	0	0	358
Tax deficiency of stock-based awards and canceled	0	(667)	0	0	0	(667)
Net share settlement for equity-based compensation	0	(531)	0	0	0	(531)
Net share settlement for equity-based compensation (in shares)	(102,438)
Cash dividend	0	0	0	(6,444)	0	(6,444)
BALANCE at Dec. 31, 2012	$ 141,377	$ 22,677	$ (82,860)	$ 124,059	$ (6,776)	$ 198,477
BALANCE (in shares) at Dec. 31, 2012	29,659,457					29,659,457