Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]	Common Stock [Member]	Common Stock [Member] Restricted Stock [Member]	Common Stock [Member] Restricted Stock Units (RSUs) [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Restricted Stock [Member]	Additional Paid-in Capital [Member] Restricted Stock Units (RSUs) [Member]	Retained Earnings [Member]	Retained Earnings [Member] Restricted Stock [Member]	Retained Earnings [Member] Restricted Stock Units (RSUs) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Restricted Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Restricted Stock Units (RSUs) [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] Restricted Stock [Member]	Noncontrolling Interest [Member] Restricted Stock Units (RSUs) [Member]
Balance at Dec. 31, 2010	$ 626,707			$ 392			$ 251,578			$ 347,249			$ 18,113			$ 9,375
Balance (in Shares) at Dec. 31, 2010	39,246,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,670			0			0			26,547			0			1,123
Issuance of common stock upon stock option exercises, including tax benefit	3,611			1			3,610			0			0			0
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	128,052
New shares issued	4,000			2			3,998			0			0			0
New shares issued (in shares)	246,760
Restricted shares issued		2	0		2	0		0	0		0	0		0	0		0	0
Restricted shares issued (in Shares)		168,018	9,934
Issuance of shares pursuant to deferred stock unit awards (in Shares)	20,640
Forfeitures of restricted shares	0			0			0			0			0			0
Forfeitures of restricted shares (in Shares)	(140,448)
Repurchase of common stock	(5,000)			(3)			(4,997)			0			0			0
Repurchase of common stock (in Shares)	(326,596)
Equity-based compensation expense	6,491			0			6,491			0			0			0
Investment by non-controlling interests	546			0			0			0			0			546
Distribution to non-controlling interests	1,661			0			0			0			0			1,661
Currency translation adjustment and derivative transactions, net	(13,377)			0			0			0			(12,251)			(1,126)
Balance at Dec. 31, 2011	648,989			394			260,680			373,796			5,862			8,257
Balance (in Shares) at Dec. 31, 2011	39,352,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,849			0			0			52,661			0			4,188
Issuance of common stock upon stock option exercises, including tax benefit	1,176			1			1,175			0			0			0
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	52,676
Restricted shares issued		2	0		2	0		0	0		0	0		0	0		0	0
Restricted shares issued (in Shares)		239,523	15,177
Issuance of shares pursuant to deferred stock unit awards (in Shares)	34,132
Forfeitures of restricted shares	0			0			0			0			0			0
Forfeitures of restricted shares (in Shares)	(36,325)
Repurchase of common stock	(12,308)			(7)			(12,301)			0			0			0
Repurchase of common stock (in Shares)	(704,997)
Equity-based compensation expense	6,767			0			6,767			0			0			0
Investment by non-controlling interests	4,939			0			0			0			0			4,939
Purchase of non-controlling interests	(5)			0			888			0			0			(893)
Currency translation adjustment and derivative transactions, net	9,711			0			0			0			9,398			313
Balance at Dec. 31, 2012	716,120			390			257,209			426,457			15,260			16,804
Balance (in Shares) at Dec. 31, 2012	38,952,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,546			0			0			44,351			0			1,195
Issuance of common stock upon stock option exercises, including tax benefit	899			0			899			0			0			0
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	29,511
Restricted shares issued		4	0		4	0		0	0		0	0		0	0		0	0
Restricted shares issued (in Shares)		435,025	13,761
Issuance of shares pursuant to deferred stock unit awards (in Shares)	7,029
Forfeitures of restricted shares	(2)			(2)			0			0			0			0
Forfeitures of restricted shares (in Shares)	(236,388)
Repurchase of common stock	(27,648)			(12)			(27,636)			0			0			0
Repurchase of common stock (in Shares)	(1,218,385)
Equity-based compensation expense	5,647			0			5,647			0			0			0
Currency translation adjustment and derivative transactions, net	(13,645)			0			9			0			(13,208)			(446)
Balance at Dec. 31, 2013	$ 726,921			$ 380			$ 236,128			$ 470,808			$ 2,052			$ 17,553
Balance (in Shares) at Dec. 31, 2013	37,983,114