Statements of Condensed Consolidated Total Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred shares at par value	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income/(loss)	Common shares held by a subsidiary	Non-controlling interests	Total comprehensive income/(loss)	Class A common shares at par value	Class B common shares at par value
Balance at Dec. 31, 2010	$ 1,066,895		$ 968,492	$ 134,043	$ (38,585)	$ (181)	$ 1,922		$ 1,023	$ 181
Increase (Decrease) in Stockholders' Equity
Issuance of class A common shares in public offering, net of issuance costs	(157)		(157)
Share based compensation	5,056		5,056
Share options exercised	3								3
Comprehensive loss:
Net losses	(59,526)			(59,674)			148	(59,526)
Other comprehensive income (loss)					(22,654)		(6)	(22,660)
Balance at Sep. 30, 2011	989,611		973,391	74,369	(61,239)	(181)	2,064		1,026	181
Balance at Dec. 31, 2011	952,525		975,330	46,263	(72,289)	(181)	2,195		1,026	181
Increase (Decrease) in Stockholders' Equity
Issuance of class A common shares in public offering, net of issuance costs	0	0	0	0	0	0	0		0	0
Share based compensation	4,340		4,340
Share options exercised	3								3
Comprehensive loss:
Net losses	13,960			13,828			132	13,960
Other comprehensive income (loss)					(25,370)		1	(25,369)
Balance at Sep. 30, 2012	$ 945,459		$ 979,670	$ 60,091	$ (97,659)	$ (181)	$ 2,328		$ 1,029	$ 181