Basic and Diluted Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share Reconciliation [Abstract]
Basic net income	$ 40,633	$ 56,997	$ 161,835	$ 202,426
Restricted stock	0	0	0	0
Performance untis	0	0	0	0
Diluted net income	$ 40,633	$ 56,997	$ 161,835	$ 202,426
Weighted average basic shares outstanding	48,416,895	48,405,860	48,411,854	48,400,778
Weighted Average Number of Shares, Restricted Stock	18,746	11,706	17,177	10,730
Weighted Average Number of Shares, Performance Units	44,766	60,626	51,572	67,425
Weighted average diluted shares outstanding	48,480,407	48,478,192	48,480,603	48,478,933
Basic EPS	$ 0.84	$ 1.18	$ 3.34	$ 4.18
Restricted stock EPS	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Performance units EPS	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Diluted EPS	$ 0.84	$ 1.18	$ 3.34	$ 4.18

Per share dilutive effect of share based payment for shares earned but not yet issued

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Per share diultive effect resutling from restrictred stock not included in basic earnings per share.

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The amount resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of convertible securities.

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The amount of adjustments to net income (loss) resulting from the assumption that dilutive convertible securities were converted. This amount excludes adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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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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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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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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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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