Selected Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Selected Quarterly Data

	2012
($ in thousands, except share data)	Fourth Quarter		Third Quarter			Second Quarter		First Quarter
Revenues	$	78,919	$	71,951		$	66,818	$	62,398
Operating Income		20,472		17,767			14,253		7,953
Net Income Attributable to Common Stockholders		12,213		11,642			8,367		5,386
Earnings per share—Basic	$	1.56	$	1.48		$	1.08	$	0.72
Earnings per share—Diluted	$	1.50	$	1.43		$	1.04	$	0.68
	2011
	Fourth Quarter		Third Quarter			Second Quarter		First Quarter
Revenues	$	56,172	$	55,457		$	48,902	$	44,121
Operating Income (Loss)		8,194		(2,193	)		3,459		4,443
Net Income (Loss) Attributable to Common Stockholders		109,555		(3,483	)		2,043		2,979
Earnings (Loss) per share—Basic	$	17.60	$	(0.56	)	$	0.33	$	0.48
Earnings (Loss) per share—Diluted	$	16.35	$	(0.56	)	$	0.30	$	0.43