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Stock-Based Compensation	3 Months Ended
	Mar. 31, 2012
Stock-Based Compensation [Abstract]
Stock-Based Compensation	13. Stock-Based Compensation Our stock-based compensation plans are described in Note 15 of the 2011 annual report on Form 10-K. During the three months ended March 31, 2012 and 2011 we recognized total Stock-Based Compensation Expense of $1,690 and $1,299, respectively. The total income tax benefit recognized in the income statement for share-based compensation arrangements during the three months ended March 31, 2012 and 2011 was $612 and $377, respectively. During the first three months of 2012 we granted 22,449 restricted shares. The weighted average grant date fair value of each share awarded was $43.65. Restricted share awards generally have a 3 year vesting period from the effective date of the grant. The total fair value of shares vested during the three months ended March 31, 2012 and 2011 was $293 and $592, respectively.

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The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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