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Share-Based Compensation (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2013
Summary of the restricted share awards
Nonvested as of January 1, 2013	114,584
Nonvested as of January 1, 2013, Weighted-Average Grant-Date Fair Value	$ 48.33
Granted	53,446
Vested	0
Forfeited	0
Nonvested as of March 31, 2013	168,030
Granted, Weighted-Average Grant-Date Fair Value	$ 70.27
Vested, Weighted-Average Grant-Date Fair Value	$ 0.00
Forfeited, Weighted-Average Grant-Date Fair Value	$ 0.00
Nonvested as of March 31, 2013, Weighted-Average Grant-Date Fair Value	$ 55.31
Performance and Service Required [Member]
Summary of the restricted share awards
Nonvested as of January 1, 2013	103,221
Granted	47,832
Vested	0
Forfeited	0
Nonvested as of March 31, 2013	151,053
Service Required [Member]
Summary of the restricted share awards
Nonvested as of January 1, 2013	11,363
Granted	5,614
Vested	0
Forfeited	0
Nonvested as of March 31, 2013	16,977

X

- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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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- Definition

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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- Definition

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).

+ References

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

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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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- Definition

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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+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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