Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011 As Restated [Member]		Sep. 30, 2012 Parent [Member]	Sep. 30, 2011 Parent [Member] As Restated [Member]	Sep. 30, 2012 Guarantor Subsidiaries [Member]	Sep. 30, 2011 Guarantor Subsidiaries [Member] As Restated [Member]	Sep. 30, 2012 Non-Guarantor Subsidiaries [Member]	Sep. 30, 2011 Non-Guarantor Subsidiaries [Member] As Restated [Member]	Sep. 30, 2012 Consolidation, Eliminations [Member]	Sep. 30, 2011 Consolidation, Eliminations [Member] As Restated [Member]
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 118,154	$ 130,041	[1]	$ 1,054	$ 105,089	$ 90,707	$ 20,272	$ 26,393	$ 4,680	$ 0	$ 0
Investing Activities:
Change in restricted cash	5,971	(2,293)	[1]	0	(26)	5,721	(2,201)	250	(66)	0	0
Purchase of property and equipment	(8,875)	(7,625)	[1]	0	0	(5,044)	(5,787)	(3,831)	(1,838)	0	0
Proceeds from disposal of property and equipment	397	51	[1]	0	0	64	51	333	0	0	0
Net cash (used in) provided by investing activities	(2,507)	(9,867)	[1]	0	(26)	741	(7,937)	(3,248)	(1,904)	0	0
Financing Activities:
Issuance of common stock—equity plans	2,399	5,261	[1]	2,399	5,261	0	0	0	0	0	0
Purchase of treasury stock and other, net	(3,270)	(5,166)	[1]	(3,270)	(5,166)	0	0	0	0	0	0
Proceeds from bank advances	7,090	0	[1]	0		0		7,090		0
Debt issuance costs	0	(1,727)	[1]		(1,727)		0		0		0
Change in intercompany receivable/payable	0	0		0	0	201	(398)	(201)	398	0	0
Net cash (used in) provided by financing activities	6,219	(961)	[1]	(871)	(961)	201	(398)	6,889	398	0	0
Effect of exchange rates on cash and cash equivalents	906	(1,173)	[1]	0	0	0	0	906	(1,173)	0	0
Net increase (decrease) in cash and cash equivalent	122,772	118,040	[1]	183	104,102	91,649	11,937	30,940	2,001	0	0
Cash and Cash Equivalents, Beginning of Period	285,512	171,618	[1]	150,171	46,012	93,285	87,619	42,056	37,987	0	0
Cash and Cash Equivalents, End of Period	$ 408,284	$ 289,658	[1]	$ 150,354	$ 150,114	$ 184,934	$ 99,556	$ 72,996	$ 39,988	$ 0	$ 0

[1] (1) As restated - See Note 14 “Restatement of Previously Issued Financial Statements” of Notes to Condensed Consolidated Financial Statements.See notes to Condensed Consolidated Financial Statements.