Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Abstract]

Income tax expense (benefit)

The Company's income tax expense consisted of the following:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Income before provision for income taxes	$	31,234		$	30,000		$	25,180		$	110,868
Income tax expense using estimated annual effective income tax rate	12,024			11,920			9,694			44,051
Out-of-period adjustment related to non-deductible expenses in 2011	—			—			757			—
Impact of discrete item, net	(148		)	—			(808		)	464
Changes in effective tax rates	1,426			1,401			1,400			—
Reduction of valuation allowance	—			(870		)	—			(870		)
Income tax expense	$	13,302		$	12,451		$	11,043		$	43,645