Statements of Consolidated Total Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred shares at par value	Common shares at par value Class A common shares at par value	Common shares at par value Class B common shares at par value	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income/(loss)	Class B common shares held by a subsidiary	Non-controlling interests
Balance at Dec. 31, 2010	$ 1,066,895	$ 0	$ 1,023	$ 181	$ 968,492	$ 134,043	$ (38,585)	$ (181)	$ 1,922
Increase (Decrease) in Stockholders' Equity
Issuance of class A common shares in public offering, net of issuance costs	(157)		0		(157)
Share based compensation	6,995				6,995
Exercised stock options and vested awards	3		3
Comprehensive loss:
Net losses attributable to common shares	(87,596)					(87,780)			184
Other comprehensive loss	(33,615)						(33,704)		89
Balance at Dec. 31, 2011	952,525	0	1,026	181	975,330	46,263	(72,289)	(181)	2,195
Increase (Decrease) in Stockholders' Equity
Share based compensation	6,776				6,776
Exercised stock options and vested awards	3		3
Comprehensive loss:
Net losses attributable to common shares	(6,888)					(7,061)			173
Other comprehensive loss	(14,093)						(14,092)		(1)
Balance at Dec. 31, 2012	938,323	0	1,029	181	982,106	39,202	(86,381)	(181)	2,367
Increase (Decrease) in Stockholders' Equity
Share based compensation	10,754				10,754
Exercised stock options and vested awards	7		7
Comprehensive loss:
Net losses attributable to common shares	(31,496)					(31,559)			63
Other comprehensive loss	(6,943)						(6,936)		(7)
Balance at Dec. 31, 2013	$ 910,645	$ 0	$ 1,036	$ 181	$ 992,860	$ 7,643	$ (93,317)	$ (181)	$ 2,423