Statements of Consolidated Total Equity - USD ($) $ in Thousands	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, 2013	$ 910,645	$ 0	$ 1,036	$ 181	$ 992,860	$ 7,643	$ (93,317)	$ (181)	$ 2,423
Increase (Decrease) in Stockholders' Equity
Share-based compensation	7,928				7,928
Exercised stock options and vested share awards	19		4		15
Dividend to non-controlling interest	(327)								(327)
Comprehensive loss:
Net earnings (losses) attributable to common shares	(1,735)					(1,880)			145
Other comprehensive loss	(154,269)						(153,103)		(1,166)
Balance at Dec. 31, 2014	762,261	0	1,040	181	1,000,803	5,763	(246,420)	(181)	1,075
Increase (Decrease) in Stockholders' Equity
Share-based compensation	6,707				6,707
Exercised stock options and vested share awards	35		8		27
Repurchase of shares	(38,007)		(33)		(32,118)	(5,856)
Dividend to non-controlling interest	(26)								(26)
Comprehensive loss:
Net earnings (losses) attributable to common shares	15,854					16,265			(411)
Other comprehensive loss	(88,399)						(88,122)		(277)
Balance at Dec. 31, 2015	658,425	0	1,015	181	975,419	16,172	(334,542)	(181)	361
Increase (Decrease) in Stockholders' Equity
Share-based compensation	6,272				6,272
Exercised stock options and vested share awards	17		5		12
Repurchase of shares	(1,992)		(2)		(2,245)	255
Dividend to non-controlling interest	(223)								(223)
Comprehensive loss:
Net earnings (losses) attributable to common shares	36,433					36,324			109
Other comprehensive loss	(12,100)						(12,235)		135
Balance at Dec. 31, 2016	$ 686,832	$ 0	$ 1,018	$ 181	$ 979,458	$ 52,751	$ (346,777)	$ (181)	$ 382