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Accounting Policies, by Policy (Policies)	6 Months Ended
Jun. 30, 2012
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	We account for share-based payment arrangements in accordance with FASB ASC 718, Compensation - Stock Compensation . During the first six months of 2012, there were no significant changes to the structure of our stock-based award plans. Pre-tax compensation expense related to stock options and performance unit awards recorded in the first six months of 2012 and 2011 was $791,000 and $595,000, respectively.See Note 9 to our consolidated financial statements in our 2011 Annual Report on Form 10-K for a detailed description of stock-based awards under our 2005 Stock Incentive Plan and 1995 Stock Incentive Plan.

Accounting Policies, by Policy (Policies)

6 Months Ended

Jun. 30, 2012

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

We account for share-based payment arrangements in accordance with FASB ASC 718, Compensation - Stock Compensation . During the first six months of 2012, there were no significant changes to the structure of our stock-based award plans. Pre-tax compensation expense related to stock options and performance unit awards recorded in the first six months of 2012 and 2011 was $791,000 and $595,000, respectively.See Note 9 to our consolidated financial statements in our 2011 Annual Report on Form 10-K for a detailed description of stock-based awards under our 2005 Stock Incentive Plan and 1995 Stock Incentive Plan.

- Definition

Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.

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