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	1,645			1,645
Equity-based compensation expense related to deferred stock units	528			528
Equity-based compensation expense related to restricted stock	174			174
Issuance of deferred stock units and restricted stock to directors	116			116
Issuance of deferred stock units to directors, shares		68,000
Issuance of restricted stock to employees, net of forfeitures, shares		82,000
Exercise of stock appreciation rights and stock options, net of surrenders, shares		39,000
Exercise of stock appreciation rights and stock options, net of surrenders	6	1		5
Impact of redeemable noncontrolling interest accretion	(309)			(309)
Impact of incremental acquisition of Procurian	(1,320)			(1,059)			(261)
Impact of subsidiary equity transactions	853			165			668
Repurchase of common stock, shares			(841,000)
Repurchase of common stock	(8,588)		(8,588)
Non controlling owners share of Accumulated Other Comprehensive Income of consolidated subsidiaries						9	(9)
Net income (loss)	10,797				9,700		1,097
Ending balance at Sep. 30, 2011	232,331	40	(20,619)	3,542,309	(3,295,599)	63	6,137
Ending balance, shares at Sep. 30, 2011		39,628,000	(3,281,000)
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	1,887			1,887
Equity-based compensation expense related to deferred stock units	332			332
Equity-based compensation expense related to restricted stock	2,417			2,417
Issuance of deferred stock units and restricted stock to directors	223			223
Issuance of deferred stock units to directors, shares		85,000
Issuance of restricted stock to employees, net of forfeitures, shares		77,000
Issuance of restricted stock to employees, net of forfeitures	(196)			(196)
Exercise of stock appreciation rights and stock options, net of surrenders, shares		58,000
Exercise of stock appreciation rights and stock options, net of surrenders	439			439
Impact of redeemable noncontrolling interest accretion	(345)			(345)
Impact of consolidated subsidiaries transactions	32,382			(3,057)			35,439
Impact of subsidiary equity transactions	6
Repurchase of common stock, shares			(930,000)
Repurchase of common stock	(8,354)		(8,354)
Net unrealized appreciation in marketable securities' and reclassification adjustments
Non controlling owners share of Accumulated Other Comprehensive Income of consolidated subsidiaries						(47)	47
Net income (loss)	8,876				8,327		549
Ending balance at Sep. 30, 2012	$ 291,158	$ 41	$ (28,973)	$ 3,545,821	$ (3,269,406)	$ 27	$ 43,648
Ending balance, shares at Sep. 30, 2012		40,949,000	(4,211,000)