CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Comprehensive Loss [Member]	Common Stock and Additional Paid-in-Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficiency [Member]	Total
BALANCE at Dec. 31, 2010		$ 433,192	$ (8,561)	$ (126,532)	$ 298,099
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(17,031)	0	0	(17,031)	(17,031)
Share-based compensation expense	0	2,397	0	0	2,397
Tax impact of forfeited vested shares	0	(221)	0	0	(221)
Other comprehensive loss:
Pension liability adjustment (net of tax)	(25,861)	0	(25,861)	0	(25,861)
COMPREHENSIVE INCOME (LOSS)	(42,892)
BALANCE at Dec. 31, 2011		435,368	(34,422)	(143,563)	257,383
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,790)	0	0	(3,790)	(3,790)
Share-based compensation expense	0	1,715	0	0	1,715
Tax impact of forfeited vested shares	0	(210)	0	0	(210)
Other comprehensive loss:
Pension liability adjustment (net of tax)	(39)	0	(39)	0	(39)
COMPREHENSIVE INCOME (LOSS)	(3,829)				(3,829)
BALANCE at Jun. 30, 2012		$ 436,873	$ (34,461)	$ (147,353)	$ 255,059