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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock-Based Compensation Expense

Stock-based compensation expense is summarized as follows:

		Years Ended December 31,
		2014				2013				2012
($ in thousands)
Stock-based compensation expense		$	9,778			$	7,960			$	6,927

Summary of Restricted Stock Units Activity

RSU activity for the year ended December 31, 2014 is summarized as follows:

		Number of shares				Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013			233,763			$	87.97
Granted			77,947			$	183.83
Forfeited			(13,860	)		$	139.61
Settled			(117,914	)		$	60.91
Outstanding at December 31, 2014			179,936			$	143.25

Summary of Stock Option Activity

Stock option activity for the year ended December 31, 2014 is summarized as follows:

		Number of shares				Weighted Average Exercise Price
Outstanding at December 31, 2013			190,160			$	20.11
Granted			—			$	—
Exercised			(27,336	)		$	27.97
Forfeited			—			$	—
Outstanding at December 31, 2014			162,824			$	18.79
Vested and exercisable at December 31, 2014			162,824			$	18.79

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- Definition

Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Stock Based Compensation Expense Table [Text Block]

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