CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Series A Convertible Preferred Stock [Member]	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]
BALANCE at Dec. 31, 2010	$ 1,247,752		$ 4,550	$ 599	$ 1,377,803	$ (233,818)	$ 77,745	$ 20,873
BALANCE (in shares) at Dec. 31, 2010			56,878,489	7,490,936
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	4,556		0	0	4,556	0	0	0
Repurchase of 2013 Convertible Notes (Note 4)	(8,383)		0	0	(8,383)	0	0	0
Issuance of 2015 Convertible Notes, net of transaction costs	11,852		0	0	11,852	0	0	0
Reclassification of capped call options (Note 4)	0		0	0	17,273	(17,273)	0	0
Stock options exercised	242		1	1	240	0	0	0
Stock options exercised (in shares)			13,625	10,000
Dividends	(350)		0	0	0	0	0	(350)
Other	(34)				(34)
Net loss	(102,379)		0	0	0	(102,220)	0	(159)
Currency translation adjustment	22,560		0	0	0	0	21,952	608
BALANCE at Sep. 30, 2011	1,175,816		4,551	600	1,403,307	(353,311)	99,697	20,972
BALANCE (in shares) at Sep. 30, 2011			56,892,114	7,500,936
BALANCE at Dec. 31, 2011	1,017,942	0	4,551	600	1,404,648	(425,702)	17,595	16,250
BALANCE (in shares) at Dec. 31, 2011			56,892,114	7,500,936
BALANCE (in shares) at Dec. 31, 2011	0	0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	3,197		0	0	3,197	0	0	0
Conversion of Class B shares to Class A shares (Note 12)	0		601	(601)	0
Conversion of Class B shares to Class A shares (Note 12) (in shares)			7,516,936	(7,516,936)
Share issuance (Note 12)	128,363	0	1,022	0	127,341
Share issuance (Note 12) (in shares)		1	12,776,079	0
Repurchase of 2013 Convertible Notes (Note 4)	(868)		0	0	(868)	0	0	0
Reclassification of capped call options (Note 4)	0				21,131	(21,131)
Stock options exercised	33		0	1	32	0	0	0
Stock options exercised (in shares)			0	16,000
Dividends	(426)		0	0	0	0	0	(426)
Other	(259)		0	0	(259)	0	0	0
Net loss	(43,309)		0	0	0	(41,485)	0	(1,824)
Currency translation adjustment	9,784		0	0	0	0	9,742	42
BALANCE at Sep. 30, 2012	$ 1,114,457	$ 0	$ 6,174	$ 0	$ 1,555,222	$ (488,318)	$ 27,337	$ 14,042
BALANCE (in shares) at Sep. 30, 2012			77,185,129	0
BALANCE (in shares) at Sep. 30, 2012	1	1