Earnings Per Share (Schedule Computing Earnings Per Share and Weighted Average Number of Shares) Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 11,511	$ 47,041
Weighted average number of shares used in calculating basic net income/(loss) per share	31,496	31,309
Stock options	113	110
Long-term incentive plan	173	114
Weighted average number of shares used in calculating diluted net income per share	31,782	31,533
Effect of stock-based compensation plans that were not included in the computation of diluted earnings per share because to do so would have been antidilutive
Average market price of common stock used for calculation of dilutive shares	$ 26.41	$ 23.97
Basic	$ 0.37	$ 1.50
Diluted	$ 0.36	$ 1.49

Average market price of common stock used for calculation of dilutive shares.

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Incremental Common Shares Attributable To Long Term Incentive Plans.

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Incremental Common Shares Attributable To Stock Options.

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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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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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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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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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