CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss) (“AOCI”)	Non-controlling Interest
Balance as of at Dec. 31, 2014	$ 448,756	$ 46	$ (53,807)	$ 3,553,430	$ (3,069,241)	$ 40	$ 18,288
Balance as of (in shares) at Dec. 31, 2014		46,405,000	(5,892,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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 (in shares)		95,000
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(3,842)	$ 1		(3,843)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		304,000
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 (in shares)		2,000
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 (in shares)	(96,277)		(96,000)
Net loss	$ (31,820)				(30,047)		(1,773)
Balance as of at Jun. 30, 2015	424,206	$ 47	$ (55,509)	3,561,691	(3,099,288)	40	17,225
Balance as of (in shares) at Jun. 30, 2015		46,806,000	(5,988,000)
Balance as of at Dec. 31, 2015	357,971	$ 47	$ (55,509)	3,563,848	(3,165,321)	40	14,866
Balance as of (in shares) at Dec. 31, 2015		46,763,000	(5,988,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation expense related to stock appreciation rights (“SARs”) and stock options	108			108
Equity-based compensation related to deferred stock units (“DSUs”)	193			193
Equity-based compensation related to restricted stock (“RS”)	7,017			7,017
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(1,536)	$ 0		(1,536)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		(258,000)
Impact of redeemable noncontrolling interest accretion	(1,103)			(1,103)
Impact of subsidiary equity transactions	1,549			1,526		(112)	135
Repurchase of common stock	$ (9,533)		$ (9,533)
Repurchase of common stock (in shares)	(1,010,000)		(1,010,000)
Net loss	$ (28,812)				(27,072)		(1,740)
Balance as of at Jun. 30, 2016	$ 325,854	$ 47	$ (65,042)	$ 3,570,053	$ (3,192,393)	$ (72)	$ 13,261
Balance as of (in shares) at Jun. 30, 2016		46,505,000	(6,998,000)