Condensed Consolidated Statements of Equity (USD $) In Thousands	Total	Common Shares in Treasury [Member]	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-controlling Interests [Member]
Beginning Balances at Dec. 31, 2011	$ 582,494	$ (153,617)	$ 93,436	$ 320,882	$ 287,662	$ 23,899	$ 10,232
Beginning Balances, shares at Dec. 31, 2011		6,865
Net (loss) income	(309,562)				(310,392)		830
Other comprehensive (loss) income	(3,251)					(3,266)	15
Stock-based compensation transactions	4,843	588		4,255
Stock-based compensation transactions, shares		32
Distributions to noncontrolling interests	(380)						(380)
Ending Balances at Sep. 30, 2012	274,144	(153,029)	93,436	325,137	(22,730)	20,633	10,697
Ending Balances, shares at Sep. 30, 2012		6,897
Beginning Balances at Dec. 31, 2012	206,674	(151,605)	93,436	321,652	(86,606)	16,650	13,147
Beginning Balances, shares at Dec. 31, 2012		6,962
Net (loss) income	11,582				11,405		177
Other comprehensive (loss) income	(3,991)					(4,137)	146
Stock-based compensation transactions	2,561	3,997		(1,436)
Stock-based compensation transactions, shares		(129)
Distributions to noncontrolling interests	(125)						(125)
Ending Balances at Sep. 30, 2013	$ 216,701	$ (147,608)	$ 93,436	$ 320,216	$ (75,201)	$ 12,513	$ 13,345
Ending Balances, shares at Sep. 30, 2013		6,833