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Share Based Compensation Plans (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of the status of the Company's restricted stock units and performance awards
Weighted Average Grant Date Fair Value, Unvested RSUs and PSAs, Beginning Balance	$ 24.41	$ 37.00	$ 41.66
Weighted Average Grant Date Fair Value, RSUs and PSAs granted	$ 29.06	$ 23.32
Weighted Average Grant Date Fair Value, Unvested RSUs and PSAs vested	$ 23.13	$ 26.27	$ 47.27
Weighted Average Grant Date Fair Value, Unvested RSUs and PSAs cancelled	$ 28.44	$ 47.46	$ 44.70
Weighted Average Grant Date Fair Value, Unvested RSUs and PSAs, Ending Balance	$ 26.11	$ 24.41	$ 37.00
Restricted Stock Units and Performance Awards [Member]
Summary of the status of the Company's restricted stock units and performance awards
Unvested RSUs and PSAs Beginning Balance	193,981	55,843	127,487
RSUs and PSAs granted	115,306	174,891
Unvested RSUs and PSAs vested	(26,840)	(15,756)	(16,658)
Unvested RSUs and PSAs cancelled	(39,306)	(20,997)	(54,986)
Unvested Restricted Stock Units and Performance Awards, Ending Balance	243,141	193,981	55,843

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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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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 as a result of the occurrence of a terminating event.

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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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