Consolidated Statements of Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Scenario, Previously Reported [Member]	Scenario, Actual [Member]	Common Stock [Member]	Common Stock [Member] Scenario, Previously Reported [Member]	Common Stock [Member] Scenario, Actual [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Scenario, Previously Reported [Member]	Additional Paid-in Capital [Member] Scenario, Actual [Member]	Retained Earnings [Member]	Retained Earnings [Member] Scenario, Previously Reported [Member]	Retained Earnings [Member] Scenario, Actual [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Scenario, Previously Reported [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Scenario, Actual [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] Scenario, Previously Reported [Member]	Noncontrolling Interest [Member] Scenario, Actual [Member]	Comprehensive Income [Member]
Balance at Dec. 31, 2009		$ 543,522	$ 553,811		$ 389	$ 389		$ 242,563	$ 242,563		$ 286,787	$ 286,787		$ 8,313	$ 18,602		$ 5,470	$ 5,470
Balance (in Shares) at Dec. 31, 2009					38,933,944	38,933,944
Net income (loss)	24,046									24,238						(192)			24,046
Issuance of common stock including tax benefit of stock option exercises	1,994			1			1,993
Issuance of common stock including tax benefit of stock option exercises (in Shares)				104,649
Restricted shares issued	2			2
Restricted shares issued (in Shares)				183,900
Issuance of shares pursuant to restricted stock unit awards (in Shares)				24,269
Issuance of shares pursuant to deferred stock unit awards (in Shares)				3,600
Forfeitures of restricted shares (in Shares)				(16,012)
Equity based compensation expense	3,720						3,720
Investment by non-controlling interests	1,681															1,681
Currency translation adjustment and derivative transactions	(15,639)						9						(15,638)			(10)			(15,639)
Total comprehensive income																			8,407
Less: total comprehensive income attributable to non-controlling interests																			202
Total comprehensive income attributable to common stockholders		14,400	8,400																8,205
Foreign currency translation revision (See Note 2)	10,289												10,289
Balance at Jun. 30, 2010	569,615			392			248,285			311,025			2,964			6,949
Balance (in Shares) at Jun. 30, 2010				39,234,350
Balance at Dec. 31, 2010	626,707	615,181	626,707		392	392		251,578	251,578		347,249	347,249		6,587	18,113		9,375	9,375
Balance (in Shares) at Dec. 31, 2010					39,246,015	39,246,015
Net income (loss)	10,400									10,635						(235)			10,400
Issuance of common stock including tax benefit of stock option exercises	3,304			1			3,303
Issuance of common stock including tax benefit of stock option exercises (in Shares)				119,559
Restricted shares issued	2			2
Restricted shares issued (in Shares)				166,276
Issuance of shares pursuant to deferred stock unit awards (in Shares)				5,681
Forfeitures of restricted shares (in Shares)				(67,461)
Equity based compensation expense	4,007						4,007
Investment by non-controlling interests	141															141
Distribution to non-controlling interests	(1,729)															(1,729)
Currency translation adjustment and derivative transactions	6,465												5,410			1,055			6,465
Total comprehensive income																			16,865
Less: total comprehensive income attributable to non-controlling interests																			(820)
Total comprehensive income attributable to common stockholders																			16,045
Foreign currency translation revision (See Note 2)	11,526												11,526
Balance at Jun. 30, 2011	$ 649,297			$ 395			$ 258,888			$ 357,884			$ 23,523			$ 8,607
Balance (in Shares) at Jun. 30, 2011				39,470,070