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)	36,344						35,189	1,155
Other comprehensive (loss)	(564)	[1]				(564)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(1,700)							(1,700)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax of $417 (212 shares) and $216 (162 shares) for the period ending March 31, 2016 and 2015, respectively	1,595			(3,428)	5,023
Purchase of Treasury Shares (786 shares)	(34,160)				(34,160)
Dividends declared ($0.155 and $0.14 per common share for the period ended March 31, 2016 and 2015, respectively)	(7,952)						(7,952)
Shares Issued for acquisitions (77 shares)	4,303			4,303
Performance share unit dividend equivalents	0			138			(138)
Ending Balance at Jun. 30, 2015	821,915		96	223,802	(38,880)	(55,159)	671,655	20,401
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 (loss)	3,845	[1]				3,845
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(172)							(172)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax of $417 (212 shares) and $216 (162 shares) for the period ending March 31, 2016 and 2015, respectively	4,553			(3,379)	7,932
Dividends declared ($0.155 and $0.14 per common share for the period ended March 31, 2016 and 2015, respectively)	(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

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