Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Abstract]

Schedule of Income Tax Provision and Effective Tax Rate

The following table provides a comparative summary of our income tax provision and effective tax rate for the three and nine months endedSeptember 30, 2012 and 2011:

	Three months ended						Nine months ended
	September 30,						September 30,
	2012			2011			2012			2011
Provision for income taxes	$	48,586		$	107		$	116,446		$	28,445
Effective tax rate	34.5		%	0.2		%	40.1		%	18.3		%