Consolidated Statements Of Changes In Equity (USD $) In Thousands	Common Stock [Member]	Treasury Stock At Cost [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Non-Controlling Interest [Member]	Total
Balance at Dec. 31, 2010	$ 39	$ (12,031)	$ 3,541,044	$ (3,305,299)	$ 54	$ 4,622	$ 228,429
Balance, shares at Dec. 31, 2010	39,439	(2,440)
Equity-based compensation expense related to stock appreciation rights and stock options			508				508
Equity-based compensation expense related to deferred stock units			85				85
Equity-based compensation expense related to restricted stock			35				35
Issuance of deferred stock units to directors			49				49
Issuance of deferred stock units to directors, shares	63
Exercise of stock appreciation rights and stock options, net of surrenders	1		(133)				(132)
Exercise of stock appreciation rights and stock options, net of surrenders, shares	19
Impact of redeemable noncontrolling interest accretion			(101)				(101)
Impact of subsidiary equity transactions			(25)			452	427
Noncontrolling owners share of Accumulated Other Comprehensive Income of consolidated subsidiary					(20)	20
Net income (loss)				15,890		408	16,298
Balance at Mar. 31, 2011	40	(12,031)	3,541,462	(3,289,409)	34	5,502	245,598
Balance, shares at Mar. 31, 2011	39,521	(2,440)
Balance at Dec. 31, 2011	41	(20,619)	3,544,121	(3,277,733)	74	7,613	253,497
Balance, shares at Dec. 31, 2011	40,729	(3,281)
Equity-based compensation expense related to stock appreciation rights and stock options			608				608
Equity-based compensation expense related to deferred stock units			159				159
Equity-based compensation expense related to restricted stock			690				690
Issuance of deferred stock units to directors			29				29
Issuance of deferred stock units to directors, shares	64
Exercise of stock appreciation rights and stock options, net of surrenders			227				227
Exercise of stock appreciation rights and stock options, net of surrenders, shares	27
Impact of redeemable noncontrolling interest accretion			(69)				(69)
Impact of incremental acquisition of consolidated subsidiary			(1,082)			(365)	(1,447)
Impact of subsidiary equity transactions			147			13	160
Repurchase of common stock		(2,660)					(2,660)
Repurchase of common stock, shares		(303)
Noncontrolling owners share of Accumulated Other Comprehensive Income of consolidated subsidiary					(14)	14
Net income (loss)				(7,020)		186	(6,834)
Balance at Mar. 31, 2012	$ 41	$ (23,279)	$ 3,544,830	$ (3,284,753)	$ 60	$ 7,461	$ 244,360
Balance, shares at Mar. 31, 2012	40,820	(3,584)