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, 2012	$ 339,032	$ 42	$ (28,973)	$ 3,549,533	$ (3,254,744)	$ 40	$ 73,134
Beginning balance (in shares) at Dec. 31, 2012		42,155	(4,211)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation expense related to stock appreciation rights (SARs) and stock options	2,377			2,377
Equity-based compensation related to deferred stock units (DSUs)	377			377
Equity-based compensation related to restricted stock (RS)	2,958			2,958
Issuance of DSUs	359			359
Issuance of DSUs (in shares)		60
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(609)	$ 0		(609)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		124
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings	(11,735)	$ 1		(11,736)
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings (in shares)		994
Impact of redeemable noncontrolling interest accretion	(1,088)			(1,088)
Impact of sale of consolidated subsidiaries	(42,315)						(42,315)
Impact of subsidiary equity transactions	(5,799)			(5,410)			(389)
Repurchase of common stock	(12,025)		$ (12,025)
Repurchase of common stock (in shares)			(907)
Net income (loss)	202,146				209,059		(6,913)
Ending balance at Dec. 31, 2013	473,678	$ 43	$ (40,998)	3,536,761	(3,045,685)	40	23,517
Ending balance (in shares) at Dec. 31, 2013		43,333	(5,118)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation expense related to stock appreciation rights (SARs) and stock options	792			792
Equity-based compensation related to deferred stock units (DSUs)	526			526
Equity-based compensation related to restricted stock (RS)	21,818			21,818
Issuance of DSUs	258			258
Issuance of DSUs (in shares)		41
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(1,822)	$ 3		(1,825)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		2,777
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings	(3,207)			(3,207)
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings (in shares)		254
Impact of redeemable noncontrolling interest accretion	(4,244)			(4,244)
Impact of subsidiary equity transactions	1,586			2,551			(965)
Repurchase of common stock	(12,809)		$ (12,809)
Repurchase of common stock (in shares)			(774)
Net income (loss)	(27,820)				(23,556)		(4,264)
Ending balance at Dec. 31, 2014	448,756	$ 46	$ (53,807)	3,553,430	(3,069,241)	40	18,288
Ending balance (in shares) at Dec. 31, 2014		46,405	(5,892)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation expense related to stock appreciation rights (SARs) and stock options	398			398
Equity-based compensation related to deferred stock units (DSUs)	234			234
Equity-based compensation related to restricted stock (RS)	23,120			23,120
Issuance of DSUs	82			82
Issuance of DSUs (in shares)		94
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings	(4,170)	$ 1		(4,171)
Issuance of RS, net of forfeitures primarily related to satisfying tax withholdings (in shares)		253
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings	(100)			(100)
Exercise of SARs and stock options, net of forfeitures related to satisfying tax withholdings (in shares)		11
Impact of redeemable noncontrolling interest accretion	(4,704)			(4,704)
Impact of subsidiary equity transactions	(4,803)			(4,441)			(362)
Repurchase of common stock	(1,702)		$ (1,702)
Repurchase of common stock (in shares)			(96)
Net income (loss)	(99,140)			0	(96,080)		(3,060)
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	(5,988)