CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]	Preferred Class A [Member] Series A Convertible Preferred Stock [Member]
BALANCE at Dec. 31, 2012	$ 631,267	$ 6,174	$ 0	$ 1,556,250	$ (982,513)	$ 46,150	$ 5,206	$ 0
BALANCE (in shares) at Dec. 31, 2012		77,185,129	0
BALANCE (in shares) at Dec. 31, 2012								1
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	994			994
Reclassification of capped call options	0			2,752	(2,752)
Dividends	(446)						(446)
Net loss	(108,962)				(108,280)		(682)
Currency translation adjustment	2,463					2,320	143
BALANCE at Mar. 31, 2013	525,316	6,174	0	1,559,996	(1,093,545)	48,470	4,221	0
BALANCE (in shares) at Mar. 31, 2013		77,185,129	0
BALANCE (in shares) at Mar. 31, 2013								1
BALANCE at Dec. 31, 2013	441,001	10,787	0	1,704,066	(1,262,916)	(11,829)	893	0
BALANCE (in shares) at Dec. 31, 2013		134,837,442	0
BALANCE (in shares) at Dec. 31, 2013								1
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	251			251
Shares issuance, stock-based compensation (in shares)		289,425
Shares issuance, stock-based compensation	0	23
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options				(23)
Preferred dividend paid-in-kind	(3,844)
Net loss	(48,633)				(47,916)		(717)
Currency translation adjustment	1,372					1,375	(3)
BALANCE at Mar. 31, 2014	$ 390,147	$ 10,810	$ 0	$ 1,700,450	$ (1,310,832)	$ (10,454)	$ 173	$ 0
BALANCE (in shares) at Mar. 31, 2014		135,126,867	0
BALANCE (in shares) at Mar. 31, 2014								1