CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (AOCI)	Non-controlling Interest
Beginning balance at Dec. 31, 2013	$ 473,678	$ 43	$ (40,998)	$ 3,536,761	$ (3,045,685)	$ 40	$ 23,517
Beginning balance (in shares) at Dec. 31, 2013		43,333	(5,118)
Equity-based compensation expense related to stock appreciation rights (SARs) and stock options	646			646
Equity-based compensation related to deferred stock units (DSUs)	347			347
Equity-based compensation related to restricted stock (RS)	15,431			15,431
Issuance of DSUs	258			258
Issuance of DSUs (in shares)		36
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(1,438)	$ 3		(1,441)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		2,802
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings	(1,356)			(1,356)
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings (in shares)		130
Impact of redeemable noncontrolling interest accretion	(1,940)			(1,940)
Impact of subsidiary equity transactions	98			279			(181)
Net income (loss)	(37,279)				(33,724)		(3,555)
Ending balance at Sep. 30, 2014	445,693	$ 46	$ (43,750)	3,548,985	(3,079,409)	40	19,781
Ending balance (in shares) at Sep. 30, 2014		46,301	(5,292)
Beginning balance at Dec. 31, 2014	448,756	$ 46	$ (53,807)	3,553,430	(3,069,241)	40	18,288
Beginning balance (in shares) at Dec. 31, 2014		46,405	(5,892)
Equity-based compensation expense related to stock appreciation rights (SARs) and stock options	340			340
Equity-based compensation related to deferred stock units (DSUs)	135			135
Equity-based compensation related to restricted stock (RS)	18,352			18,352
Issuance of DSUs	82			82
Issuance of DSUs (in shares)		94
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(3,890)	$ 1		(3,891)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		278
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings	(28)			(28)
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings (in shares)		2
Impact of redeemable noncontrolling interest accretion	(2,413)			(2,413)
Impact of subsidiary equity transactions	268			1,430			(1,162)
Repurchase of common stock	(1,702)		$ (1,702)
Repurchase of common stock (in shares)			(96)
Net income (loss)	(46,381)				(43,929)		(2,452)
Ending balance at Sep. 30, 2015	$ 413,519	$ 47	$ (55,509)	$ 3,567,437	$ (3,113,170)	$ 40	$ 14,674
Ending balance (in shares) at Sep. 30, 2015		46,779	(5,988)