Segment and Geographic Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Geographic Segment Information
Total revenues	$ 156,075	$ 138,332
[US]
Geographic Segment Information
Total revenues	10,854	9,809
[AsiaMember]
Geographic Segment Information
Total revenues	68,384	59,648
[EuropeMember]
Geographic Segment Information
Total revenues	67,945	60,791
[OtherInternationalCountriesMember]
Geographic Segment Information
Total revenues	$ 8,892	$ 8,084