Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total		Common Shares	Additional Paid-in Capital	Treasury Shares	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015	$ 783,739		$ 96	$ 222,848	$ (52,902)	$ (20,939)	$ 615,151	$ 19,485
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(181)						(273)	92
Other comprehensive income (loss)	3,845	[1]				3,845
Other change in noncontrolling interest	(172)							(172)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax of ($323) (122 shares) and $424 (207 shares)	4,553			(3,379)	7,932
Dividends declared ($0.32 and $0.31 per common share)	(8,681)						(8,681)
Restricted share award dividend equivalents				20			(20)
Ending Balance at Jun. 30, 2016	783,103		96	219,489	(44,970)	(17,094)	606,177	19,405
Beginning Balance at Dec. 31, 2016	790,697		96	222,910	(45,383)	(12,468)	609,206	16,336
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(29,752)						(29,742)	(10)
Other comprehensive income (loss)	475	[1]				475
Other change in noncontrolling interest	(8,359)							(8,359)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax of ($323) (122 shares) and $424 (207 shares)	3,732			(654)	4,386
Dividends declared ($0.32 and $0.31 per common share)	(9,001)						(9,001)
Restricted share award dividend equivalents	0			5	52		(57)
Ending Balance at Jun. 30, 2017	$ 747,792		$ 96	$ 222,261	$ (40,945)	$ (11,993)	$ 570,406	$ 7,967

[1] All amounts are net of tax. Amounts in parentheses indicate debits