Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The computation of basic and diluted earnings per share is as follows:

	Years Ended December 31,
	2014		2013			2012
($ in thousands, except per share amounts)
Net Income	$	96,965	$	77,130		$	37,773
Noncontrolling interests		735		(1,940	)		(101	)
Allocation of earnings to preferred stockholders		—		—			(64	)
Net Income Attributable to Common Stockholders	$	97,700	$	75,190		$	37,608
Shares:
Basic: Weighted-average number of shares outstanding		9,091		8,188			7,727
Plus: Incremental shares from assumed conversion of dilutive instruments		201		245			346
Diluted: Weighted-average number of shares outstanding		9,292		8,433			8,073
Earnings per share—basic	$	10.75	$	9.18		$	4.87
Earnings per share—diluted	$	10.51	$	8.92		$	4.66