CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ 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, 2014	$ 448,756	$ 46	$ (53,807)	$ 3,553,430	$ (3,069,241)	$ 40	$ 18,288
Beginning balance (in shares) at Dec. 31, 2014		46,405,000	(5,892,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation expense related to stock appreciation rights (“SARs”) and stock options	147			147
Equity-based compensation related to deferred stock units (“DSUs”)	17			17
Equity-based compensation related to restricted stock (“RS”)	6,655			6,655
Issuance of DSUs	82			82
Issuance of DSUs (in shares)		5,000
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(3,480)	$ 0		(3,480)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		198,000
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	(1,303)			(1,303)
Impact of subsidiary equity transactions	626			618			8
Repurchase of common stock (in shares)			(96,000)
Repurchase of common stock	(1,702)		$ (1,702)
Net loss	(15,857)				(14,765)		(1,092)
Ending balance at Mar. 31, 2015	433,932	$ 46	$ (55,509)	3,556,157	(3,084,006)	40	17,204
Ending balance (in shares) at Mar. 31, 2015		46,610,000	(5,988,000)
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		46,405,000	(5,892,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)	(96,277)
Ending balance at Dec. 31, 2015	$ 357,971	$ 47	$ (55,509)	3,563,848	(3,165,321)	40	14,866
Ending balance (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	58			58
Equity-based compensation related to deferred stock units (“DSUs”)	99			99
Equity-based compensation related to restricted stock (“RS”)	3,925			3,925
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(1,529)	$ 0		(1,529)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		(346,000)
Impact of redeemable noncontrolling interest accretion	(564)			(564)
Impact of subsidiary equity transactions	$ 620			492		(74)	202
Repurchase of common stock (in shares)	(470,000)		(470,000)
Repurchase of common stock	$ (4,318)		$ (4,318)
Net loss	(15,314)				(14,331)		(983)
Ending balance at Mar. 31, 2016	$ 340,948	$ 47	$ (59,827)	$ 3,566,329	$ (3,179,652)	$ (34)	$ 14,085
Ending balance (in shares) at Mar. 31, 2016		46,417,000	(6,458,000)