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Earnings Per Share - Basic and Diluted (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Weighted average common shares outstanding	135,067,278	138,551,804	145,156,045
Add: Effect of stock options and restricted stock	347,435	1,148,300	1,246,241
Weighted average common shares outstanding for diluted calculation	135,414,713	139,700,104	146,402,286

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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