Consolidated Statements Of Changes In Equity (USD $) In Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (AOCI) [Member]	Non-Controlling Interest [Member]	Total
Balance at Dec. 31, 2008	$ 39	$ (9,329)	$ 3,569,919	$ (3,367,422)	$ 54,302	$ 7,317	$ 254,826
Balance, shares at Dec. 31, 2008	38,703	(1,948)
Equity-based compensation related to stock appreciation rights (SARs) and stock options			2,632				2,632
Equity-based compensation related to deferred stock units (DSUs)			174				174
Equity-based compensation related to restricted stock (RS)			82				82
Issuance of DSUs to directors, net of forfeitures			202				202
Issuance of DSUs to directors, net of forfeitures, shares	70
Issuance of RS, net of forfeitures			(8)				(8)
Issuance of RS, net of forfeitures, shares	23
Impact of subsidiary equity transactions			331			695	1,026
Repurchase of common stock		(2,702)					(2,702)
Repurchase of common stock, shares		(492)
Noncontrolling owners share of AOCI of consolidated subsidiary					(70)	70
Net unrealized depreciation in marketable securities and reclassification adjustments					16,966		16,966
Net income (loss)				15,534		12,995	28,529
Other activity			15				15
Balance at Dec. 31, 2009	39	(12,031)	3,573,347	(3,351,888)	71,198	21,077	301,742
Balance, shares at Dec. 31, 2009	38,796	(2,440)
Equity-based compensation related to stock appreciation rights (SARs) and stock options			2,038				2,038
Equity-based compensation related to deferred stock units (DSUs)			204				204
Equity-based compensation related to restricted stock (RS)			103				103
Issuance of DSUs to directors, net of forfeitures			212				212
Issuance of DSUs to directors, net of forfeitures, shares	58
Issuance of RS, net of forfeitures			(29)				(29)
Issuance of RS, net of forfeitures, shares	32
Exercise of SARs and stock options, net of surrenders			117				117
Exercise of SARs and stock options, net of surrenders, shares	553
Impact of redeemable noncontrolling interest accretion			(197)				(197)
Impact of incremental acquisition of Procurian			(38,889)		27	(10,796)	(49,658)
Impact of subsidiary equity transactions			4,092			(6,924)	(2,832)
Noncontrolling owners share of AOCI of consolidated subsidiary					(1)	1
Net unrealized depreciation in marketable securities and reclassification adjustments					(71,170)		(71,170)
Net income (loss)				46,589		1,264	47,853
Other activity			46				46
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 related to stock appreciation rights (SARs) and stock options			2,252				2,252
Equity-based compensation related to deferred stock units (DSUs)			703				703
Equity-based compensation related to restricted stock (RS)			851				851
Issuance of DSUs to directors, net of forfeitures			165				165
Issuance of DSUs to directors, net of forfeitures, shares	73
Issuance of RS, net of forfeitures	1		(32)				(31)
Issuance of RS, net of forfeitures, shares	1,178
Exercise of SARs and stock options, net of surrenders	1		2				3
Exercise of SARs and stock options, net of surrenders, shares	39
Impact of redeemable noncontrolling interest accretion			(509)				(509)
Impact of incremental acquisition of Procurian			(1,059)			(261)	(1,320)
Impact of subsidiary equity transactions			704			816	1,520
Repurchase of common stock		(8,588)					(8,588)
Repurchase of common stock, shares		(841)
Noncontrolling owners share of AOCI of consolidated subsidiary					20	(20)
Net income (loss)				27,566		2,456	30,022
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)