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Stock-Based Compensation (Summarizes Information Related To Restricted Stock) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stock-Based Compensation [Abstract]
Non-vested shares outstanding at December 31, Beginning Balance, Shares	240,345
Non-vested shares outstanding at December 31, Beginning Balance, Weighted Average Grant Date Fair Value	$ 16.16
Granted, Shares	248,228	240,345
Granted, Weighted Average Grant Date Fair Value	$ 30.99	$ 16.16
Vested, Shares	(92,115)
Vested, Weighted Average Grant Date Fair Value	$ 16.24
Forfeited, Shares	(5,180)
Forfeited, Weighted Average Grant Date Fair Value	$ 27.40
Non-vested shares outstanding at December 31, Ending Balance, Shares	391,278	240,345
Non-vested shares outstanding at December 31, Ending Balance, Weighted Average Grant Date Fair Value	$ 25.40	$ 16.16

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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