Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Computation of earnings per common share

	Three Months Ended March 31,
	2012		2011
Numerator:
Net income to common shareholders	$	18,495	$	15,328
Net income allocated to participating securities — basic and diluted		221		74
Net income allocated to common shareholders—basic and diluted	$	18,274	$	15,254
Denominator:
Weighted-average common shares—basic		84,741		37,333
Dilutive potential common shares		701		188
Weighted average common shares—diluted		85,442		37,521
Earnings per common share:
Basic	$	0.22	$	0.41
Diluted	$	0.21	$	0.41