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Earnings Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Basic shares (in shares)	64,778	64,119	64,616	64,048
Dilutive shares (in shares)	215	191	189	203
Diluted shares (in shares)	64,993	64,310	64,805	64,251
Weighted-average antidilutive shares (in shares)	501	1,212	705	1,225

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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