Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Computation of Basic and Diluted Earnings per Share under Two-Class Method

The following table sets forth the computation of basic and diluted earnings per share under the two-class method:

	Three months ended						Six months ended
	June 30,						June 30,
	2013			2012			2013			2012
Numerator for basic and diluted earnings per share:
Net income	$	16,307		$	31,917		$	33,883		$	62,208
Effect of reallocating undistributed earnings of participating securities		(107	)		(171	)		(224	)		(336	)
Net income available under the two-class method	$	16,200		$	31,746		$	33,659		$	61,872
Denominator:
Denominator for basic earnings per share— weighted-average shares		22,953,453			22,961,130			22,971,649			22,967,558
Effect of dilutive securities:
Employee stock options		—			1,220			—			1,250
Dilutive potential common shares		—			1,220			—			1,250
Denominator for diluted earnings per share— adjusted weighted-average shares		22,953,453			22,962,350			22,971,649			22,968,808
Basic earnings per share	$	0.71		$	1.38		$	1.47		$	2.69
Diluted earnings per share	$	0.71		$	1.38		$	1.47		$	2.69