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, 2011	$ 1,017,942	$ 4,551	$ 600	$ 1,404,648	$ (425,702)	$ 17,595	$ 16,250	$ 0
BALANCE (in shares) at Dec. 31, 2011		56,892,114	7,500,936
BALANCE (in shares) at Dec. 31, 2011								0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	2,091			2,091
Conversion of Class B shares to Class A shares (in shares)		7,516,936
Conversion of Class B shares to Class A shares	0	601
Conversion of Stock, Shares Converted			(7,516,936)
Conversion of Stock, Amount Converted			(601)
Share issuance (in shares)		11,901,260
Share issuance	67,516	952		66,564
Repurchase of 2013 Convertible Notes	(868)			(868)
Reclassification of capped call options	0			21,131	(21,131)
Options exercised (in shares)			16,000
Shares issuance, stock-based compensation	33		1
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options				32
Dividends	(560)						(560)
Other	(367)			(367)
Net (loss) / income	(10,672)				(9,436)		(1,236)
Currency translation adjustment	(31,462)					(31,521)	59
BALANCE at Jun. 30, 2012	1,043,653	6,104	0	1,493,231	(456,269)	(13,926)	14,513	0
BALANCE (in shares) at Jun. 30, 2012		76,310,310	0
BALANCE (in shares) at Jun. 30, 2012								0
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	2,180			2,180
Share issuance (in shares)		57,132,931
Share issuance	151,696	4,571		147,125
Reclassification of capped call options	0			2,752	(2,752)
Shares issuance, stock-based compensation (in shares)		120,125
Shares issuance, stock-based compensation	0	10
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options				(10)
Preferred dividend paid-in-kind	(247)
Dividends	(446)						(446)
Net (loss) / income	(150,051)				(149,238)		(813)
Currency translation adjustment	(8,944)					(8,993)	49
BALANCE at Jun. 30, 2013	$ 625,455	$ 10,755	$ 0	$ 1,708,050	$ (1,134,503)	$ 37,157	$ 3,996	$ 0
BALANCE (in shares) at Jun. 30, 2013		134,438,185	0
BALANCE (in shares) at Jun. 30, 2013								1