Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Calculation of Basic and Diluted Weighted Average Shares Outstanding Earnings Per Share

The following table sets forth the calculation of basic and diluted weighted average shares outstanding and earnings per share for the indicated periods.

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	(in thousands, except per share data)
Income (numerator):
Basic:
Net income	$	39,022		$	30,547		$	79,780		$	81,521
Net income attributable to participating securities		(1,015	)		(734	)		(1,794	)		(1,681	)
Net income attributable to common stock—basic	$	38,007		$	29,813		$	77,986		$	79,840
Diluted:
Net income	$	39,022		$	30,547		$	79,780		$	81,521
Net income attributable to participating securities		(1,015	)		(733	)		(1,793	)		(1,680	)
Net income attributable to common stock—diluted	$	38,007		$	29,814		$	77,987		$	79,841
Weighted average shares (denominator):
Weighted average shares—basic		48,687			48,303			48,653			48,279
Diluted effect of stock options		38			41			38			43
Weighted average shares—diluted		48,725			48,344			48,691			48,322
Basic earnings per share	$	0.78		$	0.62		$	1.60		$	1.65
Diluted earnings per share	$	0.78		$	0.62		$	1.60		$	1.65