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	451			451
Equity-based compensation related to deferred stock units (DSUs)	246			246
Equity-based compensation related to restricted stock (RS)	9,561			9,561
Issuance of DSUs	179			179
Issuance of DSUs, shares		32
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(1,399)	$ 3		(1,402)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings, shares		2,797
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings	(1,348)			(1,348)
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings		129
Impact of redeemable noncontrolling interest accretion	(1,379)			(1,379)
Impact of subsidiary equity transactions	598			654			(56)
Net income (loss)	(25,437)				(23,044)		(2,393)
Ending balance at Jun. 30, 2014	455,150	$ 46	$ (40,998)	3,543,723	(3,068,729)	40	21,068
Ending balance (in shares) at Jun. 30, 2014		46,291	(5,118)
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	279			279
Equity-based compensation related to deferred stock units (DSUs)	36			36
Equity-based compensation related to restricted stock (RS)	12,822			12,822
Issuance of DSUs	82			82
Issuance of DSUs, shares		95
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(3,842)			(3,843)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings, shares		304
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings	(9)			(9)
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings		2
Impact of redeemable noncontrolling interest accretion	(3,639)			(3,639)
Impact of subsidiary equity transactions	3,243			2,533			710
Repurchase of common stock	(1,702)		$ (1,702)
Repurchase of common stock, shares			(96)
Net income (loss)	(31,820)				(30,047)		(1,773)
Ending balance at Jun. 30, 2015	$ 424,206	$ 47	$ (55,509)	$ 3,561,691	$ (3,099,288)	$ 40	$ 17,225
Ending balance (in shares) at Jun. 30, 2015		46,806	(5,988)