Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock	Treasury Stock at Cost	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Non-Controlling Interest
Beginning balance at Dec. 31, 2010	$ 228,429	$ 39	$ (12,031)	$ 3,541,044	$ (3,305,299)	$ 54	$ 4,622
Beginning balance, shares at Dec. 31, 2010		39,439,000	2,440,000
Equity-based compensation expense related to stock appreciation rights and stock options	1,034			1,034
Equity-based compensation expense related to deferred stock units	353			353
Equity-based compensation expense related to restricted stock	177			177
Issuance of deferred stock units and restricted stock to directors	81			81
Issuance of deferred stock units to directors, shares		65,000
Issuance of restricted stock to employees, net of forfeitures, shares		82,000
Exercise of stock appreciation rights and stock options, net of surrenders	(124)	1		(125)
Exercise of stock appreciation rights and stock options, net of surrenders, shares		24,000
Impact of redeemable non controlling interest accretion	(199)			(199)
Impact of incremental acquisition of consolidated subsidiary	(1,320)			(1,059)			(261)
Impact of subsidiary equity transactions	1,221			556			665
Repurchase of common stock	(770)		(770)
Repurchase of common stock, shares			(67,000)
Non controlling owners share of Accumulated Other Comprehensive Income of consolidated subsidiary						(15)	15
Net income (loss)	13,369				12,657		712
Ending balance at Jun. 30, 2011	242,251	40	(12,801)	3,541,862	(3,292,642)	39	5,753
Ending balance, shares at Jun. 30, 2011		39,610,000	(2,507,000)
Beginning balance at Dec. 31, 2011	253,497	41	(20,619)	3,544,121	(3,277,733)	74	7,613
Beginning balance, shares at Dec. 31, 2011		40,729,000	(3,281,000)
Equity-based compensation expense related to stock appreciation rights and stock options	1,226			1,226
Equity-based compensation expense related to deferred stock units	246			246
Equity-based compensation expense related to restricted stock	1,599			1,599
Issuance of deferred stock units and restricted stock to directors	135			135
Issuance of deferred stock units to directors, shares		76,000
Issuance of restricted stock to employees, net of forfeitures	(188)			(188)
Issuance of restricted stock to employees, net of forfeitures, shares		77,000
Exercise of stock appreciation rights and stock options, net of surrenders	252			252
Exercise of stock appreciation rights and stock options, net of surrenders, shares		31,000
Impact of redeemable non controlling interest accretion	(211)			(211)
Impact of incremental acquisition of consolidated subsidiary	(1,529)			(1,144)			(385)
Impact of subsidiary equity transactions	735			(774)			1,509
Repurchase of common stock	(4,114)		(4,114)
Repurchase of common stock, shares			468,000
Net unrealized appreciation in marketable securities and reclassification adjustments	119					119
Non controlling owners share of Accumulated Other Comprehensive Income of consolidated subsidiary						9	(9)
Net income (loss)	(12,119)				(13,014)		895
Ending balance at Jun. 30, 2012	$ 239,648	$ 41	$ (24,733)	$ 3,545,262	$ (3,290,747)	$ 202	$ 9,623
Ending balance, shares at Jun. 30, 2012		40,913,000	(3,749,000)