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, 2014	$ 824,049		$ 96	$ 222,789	$ (9,743)	$ (54,595)	$ 644,556	$ 20,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	35,394						33,961	1,433
Other comprehensive (loss)	(2,864)	[1]				(2,864)
Other change in noncontrolling interest	(2,453)							(2,453)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax of $471 (202 shares)	2,226			(2,635)	4,861
Purchase of Treasury Shares (1,193 shares)	(49,089)				(49,089)
Dividends declared ($0.42 and $0.465 per common share)	(11,872)						(11,872)
Shares Issued for acquisitions (77 shares)	4,303			4,303
Performance share unit dividend equivalents	0			138			(138)
Ending Balance at Sep. 30, 2015	799,694		96	224,595	(53,971)	(57,459)	666,507	19,926
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 (loss)	3,634	[1]				3,634
Cash distributions 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 $471 (202 shares)	6,230			(1,542)	7,772
Dividends declared ($0.42 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

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