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]
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	1,521	0	0	1,521	0	0	0
Repurchase of 2013 Convertible Notes	(6,742)	0	0	(6,742)	0	0	0
Issuance of 2015 Convertible Notes, net of transaction costs	9,380	0	0	9,380	0	0	0
Reclassification of capped call options	0	0	0	9,971	(9,971)	0	0
Stock Issued During Period, Value, Stock Options Exercised	17	0	0	17	0	0	0
Stock options exercised		1,000	0
Dividends	(358)	0	0	0	0	0	(358)
Net (loss) / income	(20,995)	0	0	0	(21,114)	0	119
Currency translation adjustment	108,395	0	0	0	0	107,915	480
BALANCE at Mar. 31, 2011	1,338,970	4,550	599	1,391,950	(264,903)	185,660	21,114
BALANCE (in shares) at Mar. 31, 2011		56,879,489	7,490,936
BALANCE at Dec. 31, 2011	1,017,942	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
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	1,087	0	0	1,087	0	0	0
Dividends	(487)	0	0	0	0	0	(487)
Other	(227)	0	0	(227)	0	0	0
Net (loss) / income	(13,813)	0	0	0	(13,392)	0	(421)
Currency translation adjustment	67,090	0	0	0	0	67,096	(6)
BALANCE at Mar. 31, 2012	$ 1,071,592	$ 4,551	$ 600	$ 1,405,508	$ (439,094)	$ 84,691	$ 15,336
BALANCE (in shares) at Mar. 31, 2012		56,892,114	7,500,936