Consolidated Statements of Equity (Unaudited) (USD $) In Thousands, except Share data	Restricted Stock [Member] Common Stock [Member] USD ($)	Restricted Stock [Member] USD ($)	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Noncontrolling Interest [Member] USD ($)	Total USD ($)
Balance at Dec. 31, 2011				$ 394	$ 260,680	$ 373,796	$ 5,862	$ 8,257	$ 648,989
Balance (in Shares) at Dec. 31, 2011				39,352,375
Net income						6,724		425	7,149
Issuance of common stock including tax benefit				1	670				671
Issuance of common stock including tax benefit (in Shares)				11,623
Restricted shares issued	2	2
Restricted shares issued (in Shares)	251,054		11,936
Issuance of shares pursuant to deferred stock unit awards (in Shares)				8,937
Forfeitures of restricted shares (in Shares)				(7,825)
Shares repurchased and retired				(4)	(6,033)				(6,037)
Shares repurchased and retired (in Shares)				(367,028)
Equity-based compensation expense					1,541				1,541
Investment by non-controlling interests								3,920	3,920
Currency translation adjustment and derivative transactions							2,965	337	3,302
Balance at Mar. 31, 2012				393	256,858	380,520	8,827	12,939	659,537
Balance (in Shares) at Mar. 31, 2012				39,261,072
Balance at Dec. 31, 2012				390	257,209	426,457	15,260	16,804	716,120
Balance (in Shares) at Dec. 31, 2012				38,955,610
Net income						2,712		626	3,338
Issuance of common stock upon stock option exercises including tax benefit				0	634				634
Issuance of common stock upon stock option exercises including tax benefit (in Shares)				29,511					29,511
Restricted shares issued	4	4
Restricted shares issued (in Shares)	395,927		10,661
Issuance of shares pursuant to deferred stock unit awards (in Shares)				3,171
Forfeitures of restricted shares (in Shares)				(4,693)
Shares repurchased and retired				(2)	(4,580)				(4,582)
Shares repurchased and retired (in Shares)				(200,038)
Equity-based compensation expense					1,835				1,835
Currency translation adjustment and derivative transactions							(9,481)	(111)	(9,592)
Balance at Mar. 31, 2013				$ 392	$ 255,098	$ 429,169	$ 5,779	$ 17,319	$ 707,757
Balance (in Shares) at Mar. 31, 2013				39,190,149