Earnings Per Share Computation Of Basic And Diluted Earnings Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Line Items]
Net income	$ 15,523	$ 19,997
Basic earnings per share	$ 0.27	$ 0.34
Diluted earnings per share	$ 0.26	$ 0.34
Earnings Per Share, Basic [Member]
Earnings Per Share [Line Items]
Net income	15,523	19,997
Income allocated to participating securities	(163)	(204)
Net income available to common shareholders	15,360	19,793
Weighted average common shares outstanding - basic	57,720	57,622
Basic earnings per share	$ 0.27	$ 0.34
Earnings Per Share, Diluted [Member]
Earnings Per Share [Line Items]
Net income	15,523	19,997
Income allocated to participating securities	(162)	(204)
Weighted average common shares outstanding - basic	57,720	57,622
Net income available to common shareholders	$ 15,361	$ 19,793
Diluted effect of stock options and PVRSUs	361	100
Weighted average shares outstanding - diluted	58,081	57,722
Diluted earnings per share	$ 0.26	$ 0.34

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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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 portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Aggregate of earnings distributed and earnings allocated to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed.

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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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