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Earnings Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Denominator:
Basic common shares outstanding	44,317	44,302	44,658	45,590	45,743	45,746	45,724	45,674	44,631	45,722	45,184
Effect of dilutive stock options and restricted stock									474	674	319
Diluted common shares outstanding	44,868	44,787	45,018	46,089	46,346	46,351	46,557	46,325	45,105	46,396	45,503

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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