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Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes
Income tax provision	$ 12,291,000	$ 6,615,000
Effective income tax rate (as a percent)	19.40%	12.00%
Income tax benefit due to change in estimate related to uncertain tax position		$ 3,300,000
Period applicable for special income tax concession in Singapore	5 years

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- Definition

Represents the period applicable for income tax concession.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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