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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

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

Summary of Company Estimated Grant-date Fair Value of Stock Options Last Granted Using Black-Scholes Option Valuation Model

The Company estimated the grant-date fair value of stock options last granted using the Black-Scholes option valuation model with the following assumptions:

		2011
Expected dividend yield			0.0%
Expected volatility			47.2%
Risk-free interest rate			2.4%-2.9%
Expected life			6.5 years

Summary of Stock-based Compensation Expense

Stock-based compensation expense is summarized as follows:

		Years Ended December 31,
		2013				2012				2011
($ in thousands)
Stock-based compensation expense		$	7,960			$	6,927			$	5,625

Summary of Stock Option Activity

Stock option activity for the year ended December 31, 2013 is summarized as follows:

		Number of shares				Weighted Average Exercise Price
Outstanding at December 31, 2012			220,349			$	20.03
Granted			—			$	—
Exercised			(29,826	)		$	19.10
Forfeited			(363	)		$	55.18
Outstanding at December 31, 2013			190,160			$	20.11
Vested and exercisable at December 31, 2013			182,077			$	18.54
Stock options expected to vest at December 31, 2013			8,083			$	55.33

Summary of Restricted Stock Units Activity

RSU activity for the year ended December 31, 2013 is summarized as follows:

		Number of shares				Weighted Average Grant Date Fair Value
Outstanding at December 31, 2012			292,057			$	57.89
Granted			46,000			$	188.36
Forfeited			(12,750	)		$	94.22
Settled			(91,544	)		$	41.45
Outstanding at December 31, 2013			233,763			$	87.97

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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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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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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ 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 (f)(2)

-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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