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Stock-Based Compensation Unrestricted Stock Awards Summary (Details) (Unrestricted Stock Award [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Unrestricted Stock Award [Member]
[Line Items]
Shares of unrestricted stock granted	4,329	5,453
Weighted average grant date fair value per share	$ 45.43	$ 37.55

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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