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)	3,160						1,449	1,711
Other comprehensive income (loss)	3,634	[1]				3,634
Cash distribution to noncontrolling interest	(3,400)							(3,400)
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 $471 (202 shares)	6,230			(1,542)	7,772
Dividends declared ($0.480 and $0.465 per common share)	(13,024)						(13,024)
Restricted share award dividend equivalents				20			(20)
Ending Balance at Sep. 30, 2016	780,167		96	221,326	(45,130)	(17,305)	603,556	17,624
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)	(27,135)						(27,208)	73
Other comprehensive income (loss)	2,786	[1]				2,786
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 $471 (202 shares)	5,325			899	4,426
Dividends declared ($0.480 and $0.465 per common share)	(13,503)						(13,503)
Restricted share award dividend equivalents	0			5	52		(57)
Ending Balance at Sep. 30, 2017	$ 749,811		$ 96	$ 223,814	$ (40,905)	$ (9,682)	$ 568,438	$ 8,050

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