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INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
INCOME TAXES
Income tax provision	$ 9,356	$ 17,072
Effective income tax rate (as a percent)	0.44%	0.57%
Material changes to uncertain tax positions	0
Material changes to uncertain tax positions within 12 months of the reporting date	$ 0

- 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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- Definition

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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